Blueberry

Blueberries are perennial flowering plants with blue or purple berries. They are classified in the section Cyanococcus within the genus Vaccinium. Vaccinium also includes cranberries, bilberries, huckleberries and Madeira blueberries.[1] Commercial blueberries—both wild (lowbush) and cultivated (highbush)—are all native to North America. The highbush varieties were introduced into Europe during the 1930s.[2]

This article is about the "North American" blueberry. For the "European" blueberry, see Bilberry.
For other uses, see Blueberry (disambiguation).

Blueberry
Vaccinium corymbosum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Ericales
Family: Ericaceae
Genus: Vaccinium
Section: Vaccinium sect. Cyanococcus
Rydb.
Species

See text

Blueberries showing various stages of maturation. IG = Immature Green, GP = Green Pink, BP = Blue Pink, and R = Ripe.

Blueberries are usually prostrate shrubs that can vary in size from 10 centimeters (3.9 in) to 4 meters (13 ft) in height. In commercial production of blueberries, the species with small, pea-size berries growing on low-level bushes are known as "lowbush blueberries" (synonymous with "wild"), while the species with larger berries growing on taller cultivated bushes are known as "highbush blueberries". Canada is the leading producer of lowbush blueberries, while the United States produces some 40% of the world supply of highbush blueberries.

Origin and history of cultivation
Flowers on a cultivated blueberry bush

The genus Vaccinium has a mostly circumpolar distribution, with species mainly present in North America, Europe, and Asia.[1] Many commercially sold species with English common names including "blueberry" are from North America, particularly Atlantic Canada and Northeastern United States for wild (lowbush) blueberries, and several US states and British Columbia for cultivated (highbush) blueberries.[3][4] Canada's First Nations people consumed wild blueberries for centuries before North America was colonized.[3] Highbush blueberries were first cultivated in New Jersey around the beginning of the 20th century.[4]

North American native species of blueberries are grown commercially in the Southern Hemisphere in Australia, New Zealand and South American nations.[5] The Colombian or Andean blueberry, Vaccinium meridionale, is wild-harvested and commonly available locally. Several other wild shrubs of the genus Vaccinium also produce commonly eaten blue berries, such as the predominantly European Vaccinium myrtillus and other bilberries, which in many languages have a name that translates to "blueberry" in English.

Description

Five species of blueberries grow wild in Canada, including Vaccinium myrtilloides, Vaccinium angustifolium, and Vaccinium corymbosum which grow on forest floors or near swamps.[6] Wild (lowbush) blueberries are not planted by farmers, but rather are managed on berry fields called "barrens".[3]

Wild blueberries reproduce by cross pollination, with each seed producing a plant with a different genetic composition, causing within the same species differences in growth, productivity, color, leaf characteristics, disease resistance, flavor, and other fruit characteristics.[6] The mother plant develops underground stems called rhizomes, allowing the plant to form a network of rhizomes creating a large patch (called a clone) which is genetically distinct.[6] Floral and leaf buds develop intermittently along the stems of the plant, with each floral bud giving rise to 5-6 flowers and the eventual fruit.[6] Wild blueberries prefer an acidic soil between 4.2 to 5.2 pH and only moderate amounts of moisture.[6] They have a hardy cold tolerance in their Canadian range.[6] Fruit productivity of lowbush blueberries varies by the degree of pollination, genetics of the clone, soil fertility, water availability, insect infestation, plant diseases, and local growing conditions.[6] Wild (lowbush) blueberries have an average mature weight of 0.3 grams (0.011 oz).[6]

Highbush (cultivated) blueberries prefer sandy or loam soils, having shallow root systems that benefit from mulch and fertilizer.[7] The leaves of highbush blueberries can be either deciduous or evergreen, ovate to lanceolate, and 1–8 cm (0.39–3.15 in) long and 0.5–3.5 cm (0.20–1.38 in) broad. The flowers are bell-shaped, white, pale pink or red, sometimes tinged greenish.

The fruit is a berry 5–16 millimeters (0.20–0.63 in) in diameter with a flared crown at the end; they are pale greenish at first, then reddish-purple, and finally dark purple when ripe. They are covered in a protective coating of powdery epicuticular wax, colloquially known as the "bloom".[8] They have a sweet taste when mature, with variable acidity. Blueberry bushes typically bear fruit in the middle of the growing season: fruiting times are affected by local conditions such as climate, altitude and latitude, so the time of harvest in the northern hemisphere can vary from May to August.

Species

Note: habitat and range summaries are from the Flora of New Brunswick, published in 1986 by Harold R. Hinds, and Plants of the Pacific Northwest coast, published in 1994 by Pojar and MacKinnon.

Some other blue-fruited species of Vaccinium:

  • Wild blueberry in autumn foliage, Pilot Mountain, North Carolina, in October
  • A maturing 'Polaris' blueberry (Vaccinium corymbosum)
  • A selection of blueberries, showing the typical sizes of the berries. The scale is marked in centimeters.

Identification

Commercially offered blueberries are usually from species that naturally occur only in eastern and north-central North America. Other sections in the genus are native to other parts of the world, including the Pacific Northwest and southern United States,[10] South America, Europe, and Asia. Other wild shrubs in many of these regions produce similar-looking edible berries, such as huckleberries and whortleberries (North America) and bilberries (Europe). These species are sometimes called "blueberries" and sold as blueberry jam or other products.

The names of blueberries in languages other than English often translate as "blueberry", e.g. Scots blaeberry and Norwegian blåbær. Blaeberry, blåbær and French myrtilles usually refer to the European native bilberry (V. myrtillus), while bleuets refers to the North American blueberry. Russian голубика ("blue berry") does not refer to blueberries, which are non-native and nearly unknown in Russia, but rather to their close relatives, bog bilberries (V. uliginosum).

Cyanococcus blueberries can be distinguished from the nearly identical-looking bilberries by their flesh color when cut in half. Ripe blueberries have light green flesh, while bilberries, whortleberries and huckleberries are red or purple throughout.

Uses
Blueberries, raw
A dish of blueberries
Nutritional value per 100 g (3.5 oz)
Energy240 kJ (57 kcal)
14.49 g
Sugars9.96 g
Dietary fiber2.4 g
0.33 g
0.74 g
VitaminsQuantity %DV†
Vitamin A equiv.
0%
32 μg
80 μg
Vitamin A54 IU
Thiamine (B1)
3%
0.037 mg
Riboflavin (B2)
3%
0.041 mg
Niacin (B3)
3%
0.418 mg
Pantothenic acid (B5)
2%
0.124 mg
Vitamin B6
4%
0.052 mg
Folate (B9)
2%
6 μg
Vitamin C
12%
9.7 mg
Vitamin E
4%
0.57 mg
Vitamin K
18%
19.3 μg
MineralsQuantity %DV†
Calcium
1%
6 mg
Iron
2%
0.28 mg
Magnesium
2%
6 mg
Manganese
16%
0.336 mg
Phosphorus
2%
12 mg
Potassium
2%
77 mg
Sodium
0%
1 mg
Zinc
2%
0.165 mg
Other constituentsQuantity
Water84 g
Link to USDA Database entry
†Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

Blueberries are sold fresh or are processed as individually quick frozen (IQF) fruit, purée, juice, or dried or infused berries. These may then be used in a variety of consumer goods, such as jellies, jams, blueberry pies, muffins, snack foods, or as an additive to breakfast cereals.

Blueberry jam is made from blueberries, sugar, water, and fruit pectin. Blueberry sauce is a sweet sauce prepared using blueberries as a primary ingredient.

Blueberry wine is made from the flesh and skin of the berry, which is fermented and then matured; usually the lowbush variety is used.

Nutrients

Blueberries consist of 14% carbohydrates, 0.7% protein, 0.3% fat and 84% water (table). They contain only negligible amounts of micronutrients, with moderate levels (relative to respective Daily Values) (DV) of the essential dietary mineral manganese, vitamin C, vitamin K and dietary fiber (table).[11] Generally, nutrient contents of blueberries are a low percentage of the DV (table). One serving provides a relatively low caloric value of 57 kcal with a glycemic load of 6.[11]

Phytochemicals and research

Blueberries contain anthocyanins, other polyphenols and various phytochemicals under preliminary research for their potential role in the human body. Most polyphenol studies have been conducted using the highbush cultivar of blueberries (V. corymbosum), while content of polyphenols and anthocyanins in lowbush (wild) blueberries (V. angustifolium) exceeds values found in highbush cultivars.[12]

Cultivation

Blueberries may be cultivated, or they may be picked from semiwild or wild bushes. In North America, the most common cultivated species is V. corymbosum, the northern highbush blueberry. Hybrids of this with other Vaccinium species adapted to southern U.S. climates are known collectively as southern highbush blueberries.[14]

So-called "wild" (lowbush) blueberries, smaller than cultivated highbush ones, have intense color. The lowbush blueberry, V. angustifolium, is found from the Atlantic provinces westward to Quebec and southward to Michigan and West Virginia. In some areas, it produces natural "blueberry barrens", where it is the dominant species covering large areas. Several First Nations communities in Ontario are involved in harvesting wild blueberries.

"Wild" has been adopted as a marketing term for harvests of managed native stands of lowbush blueberries. The bushes are not planted or genetically manipulated, but they are pruned or burned over every two years, and pests are "managed".[15]

Numerous highbush cultivars of blueberries are available, with diversity among them, each having individual qualities. A blueberry breeding program has been established by the USDA-ARS breeding program at Beltsville, Maryland, and Chatsworth, New Jersey. This program began when Frederick Vernon Coville of the USDA-ARS collaborated with Elizabeth Coleman White of New Jersey.[16] In the early part of the 20th century, White offered pineland residents cash for wild blueberry plants with unusually large fruit.[17] After 1910 Coville began to work on blueberry, and was the first to discover the importance of soil acidity (blueberries need highly acidic soil), that blueberries do not self-pollinate, and the effects of cold on blueberries and other plants.[18] In 1911, he began a program of research in conjunction with White, daughter of the owner of the extensive cranberry bogs at Whitesbog in the New Jersey Pine Barrens. His work doubled the size of some strains' fruit, and by 1916, he had succeeded in cultivating blueberries, making them a valuable crop in the Northeastern United States.[19][20] For this work he received the George Roberts White Medal of Honor from the Massachusetts Horticultural Society.

The rabbiteye blueberry (Vaccinium virgatum syn. V. ashei) is a southern type of blueberry produced from the Carolinas to the Gulf Coast states. Production of rabbiteye blueberries was a focus in Texas in the early 21st century.[21] Other important species in North America include V. pallidum, the hillside or dryland blueberry. It is native to the eastern U.S., and common in the Appalachians and the Piedmont of the Southeast. Sparkleberry, V. arboreum, is a common wild species on sandy soils in the Southeast.

Successful blueberry cultivation requires attention to soil pH (acidity) measurements in the acidic range.[22][23][24]

Blueberry bushes often require supplemental fertilization,[23] but over-fertilization with nitrogen can damage plant health, as evidenced by nitrogen-burn visible on the leaves.[22][23]

  • Blueberry harvester in Michigan
  • The process of making blueberry jam

Growing regions
Worldwide highbush blueberry growing areas

Significant production of highbush blueberries occurs in British Columbia, Maryland, Western Oregon, Michigan, New Jersey, North Carolina, and Washington. The production of southern highbush varieties occurs in California, as varieties originating from University of Florida, Connecticut, New Hampshire, North Carolina State University and Maine have been introduced. Peru, Spain, and Mexico also have significant production, as of 2018 (see Production).[25][5]

United States

In 2018, Oregon produced the most cultivated blueberries, recording 131 million pounds (60 million kg), an amount slightly exceeding the production by Washington.[26] In descending order of production volume for 2017, other major producers were Georgia, Michigan, New Jersey, California, and North Carolina.[27]

Hammonton, New Jersey claims to be the "Blueberry Capital of the World",[28] with over 80% of New Jersey's cultivated blueberries coming from this town.[29] Every year the town hosts a large festival which draws thousands of people to celebrate the fruit.[30]

Resulting from cultivation of both lowbush (wild) and highbush blueberries, Maine accounts for 10% of all blueberries grown in North America with 44,000 hectares (110,000 acres) farmed, but only half this acreage is harvested each year due to variations in pruning practices.[31] The wild blueberry is the official fruit of Maine.[32]

Canada
Wild blueberry fields in Nova Scotia, Canada

Canadian production of wild and cultivated blueberries in 2015 was 166,000 tonnes valued at $262 million, the largest fruit crop produced nationally accounting for 29% of all fruit value.[33]

British Columbia was the largest Canadian producer of cultivated blueberries, yielding 70,000 tonnes in 2015,[33] the world's largest production of blueberries by region.[34]

Atlantic Canada contributes approximately half of the total North American wild/lowbush annual production with New Brunswick having the largest in 2015, an amount expanding in 2016.[35] Nova Scotia, Prince Edward Island and Québec are also major producers.[36] Nova Scotia recognizes the wild blueberry as its official provincial berry,[37] with the town of Oxford, Nova Scotia known as the Wild Blueberry Capital of Canada.[38]

Québec is a major producer of wild blueberries, especially in the regions of Saguenay-Lac-Saint-Jean (where a popular name for inhabitants of the regions is bleuets, or "blueberries") and Côte-Nord, which together provide 40% of Québec's total provincial production. This wild blueberry commerce benefits from vertical integration of growing, processing, frozen storage, marketing and transportation within relatively small regions of the province.[39] On average, 80% of Québec wild blueberries are harvested on farms (21 million kg), the remaining 20% being harvested from public forests (5 million kg).[39] Some 95% of the wild blueberry crop in Québec is frozen for export out of the province.[39]

Vaccinium meridionale, a wild species found in the Andes

Europe

Highbush blueberries were first introduced to Germany, Sweden and the Netherlands in the 1930s, and have since been spread to Lithuania, Latvia, Estonia, Romania, Poland, Italy, Hungary and other countries of Europe.[2]

Southern Hemisphere

In the Southern Hemisphere, Chile, Argentina, Peru, Uruguay, New Zealand, Australia, and South Africa grow blueberries commercially.[5][40]

Blueberries were first introduced to Australia in the 1950s, but the effort was unsuccessful. In the early 1970s, the Victorian Department of Agriculture imported seed from the U.S. and a selection trial was started. This work was continued into the mid-1970s when the Australian Blueberry Growers' Association was formed.[41]

In the 21st century, the industry grew in Argentina: "Argentine blueberry production has increased over the last three years with planted area up to 400 percent," according to a 2005 report by the U.S. Department of Agriculture.[42] "Argentine blueberry production has thrived in four different regions: the province of Entre Rios in northeastern Argentina, the province of Tucuman, the province of Buenos Aires and the southern Patagonian valleys", according to the report.[43] In the Bureau of International Labor Affairs report of 2014 on child labor and forced labor, blueberries were listed among the goods produced in such working conditions in Argentina.[44]

Production
Blueberry production – 2018
Country (tonnes)
 United States
255,050
 Canada
164,205
 Peru
94,805
 Spain
43,516
 Mexico
40,251
World
682,790
Source: FAOSTAT of the United Nations[5]

In 2018, world production of blueberries (lowbush and highbush combined) increased by 14% over 2017, with substantial production increases by Peru (81% increase) and Spain (23% increase).[5] Total world production was 682,790 tonnes, led by the United States with 37% of global production and Canada with 24%.[5]

In 2019, Canada was the largest producer of wild blueberries, mainly in Quebec and the Atlantic provinces,[45] but the production effort for wild blueberries was changing in 2017 to the more profitable cultivated highbush blueberries.[46] British Columbia produced 93% of the Canadian highbush blueberry crop in 2019.[45]

Regulations

Canada

Canada No. 1 blueberries are all similar in size, shape, weight, and color—the total product can be no more than ten percent off-color and three percent otherwise defective.[47]

Pesticides

Because "wild" is a marketing term generally used for all low-bush blueberries, it is not an indication that such blueberries are free from pesticides.[48]

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See also

References
  1. Lisa J. Rowland, Freddi A. Hammerschlag (2005). Richard E. Litz (ed.). Vaccinium spp. (8.1: Blueberry). In: Biotechnology of Fruit and Nut Crops: Volume 29 of Biotechnology in Agriculture Series. CABI. ISBN 0851990665.CS1 maint: uses authors parameter (link)
  2. Naumann, W. D. (1993). "Overview of the Vaccinium Industry in Western Europe". In K. A. Clayton-Greene (ed.). Fifth International Symposium on Vaccinium Culture. Wageningen, the Netherlands: International Society for Horticultural Science. pp. 53–58. ISBN 978-90-6605-475-2. OCLC 29663461.
  3. "Canadian blueberries". Agriculture and Agri-Food Canada, Government of Canada. 9 August 2018. Retrieved 5 February 2020.
  4. "Blueberries – Celebrating 100 Years". US Highbush Blueberry Council. 2020. Retrieved 5 February 2020.
  5. "Blueberry production in 2018; Crops/Regions/World list/Production Quantity (pick lists)". UN Food and Agriculture Organization, Corporate Statistical Database (FAOSTAT). 2019. Retrieved 21 February 2020.
  6. "Wild Blueberry Fact Sheet A.2.0. Growth and Development of the Wild Blueberry" (PDF). Agriculture, Aquaculture and Fisheries, Province of New Brunswick, Canada. Retrieved 5 February 2020.
  7. Becky Sideman (1 August 2016). "Growing fruit: Highbush blueberries" (PDF). University of New Hampshire Cooperative Extension. Retrieved 5 February 2020.
  8. "Blueberry Information". Jerseyfruit.com. Retrieved 2013-11-06.
  9. Plunkett, Blue J.; Espley, Richard V.; Dare, Andrew P.; Warren, Ben A. W.; Grierson, Ella R. P.; Cordiner, Sarah; Turner, Janice L.; Allan, Andrew C.; Albert, Nick W.; Davies, Kevin M.; Schwinn, Kathy E. (11 September 2018). "MYBA From Blueberry (Vaccinium Section Cyanococcus) Is a Subgroup 6 Type R2R3MYB Transcription Factor That Activates Anthocyanin Production". Frontiers in Plant Science. 9: 1300. doi:10.3389/fpls.2018.01300. ISSN 1664-462X. PMC 6141686. PMID 30254656.
  10. "Plants Profile: Vaccinium corymbosum L., Highbush blueberry". US Department of Agriculture, National Resources Conservation Service. 2013. Retrieved 30 April 2013.
  11. "In-depth nutrition information on raw blueberries, per 100 g, USDA Nutrient Database, Standard Reference version SR-21". Nutritiondata.com. Conde Nast. 2014. Retrieved 28 November 2014.
  12. Kalt W, Ryan DA, Duy JC, Prior RL, Ehlenfeldt MK, Vander Kloet SP (October 2001). "Interspecific variation in anthocyanins, phenolics, and antioxidant capacity among genotypes of highbush and lowbush blueberries (Vaccinium section cyanococcus spp.)". J Agric Food Chem. 49 (10): 4761–7. doi:10.1021/jf010653e. ISSN 0021-8561. PMID 11600018.
  13. "Flavonoids". Micronutrient Information Center, Linus Pauling Institute, Oregon State University, Corvallis, OR. November 2015. Retrieved 25 December 2017.
  14. "Growing Highbush Blueberries" (PDF). University of New Hampshire-Extension. Retrieved September 22, 2013.
  15. "Wild Blueberry Network Information Centre". Wild Blueberry Network Information Centre.
  16. "Blueberry Growing Comes to the National Agricultural Library". US Department of Agriculture, Agricultural Research Magazine, Vol. 59, No. 5. June 2011. Retrieved 17 June 2011.
  17. "The History of Whitesbog Village". Whitesbog.org. 2014. Archived from the original on 2008-05-15. Retrieved 2011-10-11.
  18. Mirsky, Steve. "Early 20th Century Botanist Gave Us Domesticated Blueberries". Scientific American. Retrieved September 21, 2013.
  19. "History of White's Bog". Whitesbog Preservation Trust. Archived from the original on 2008-05-15. Retrieved 2008-01-11.
  20. Jim Minick (June 29, 2016). "The Delicious Origins of The Domesticated Blueberry". JSTOR News. Retrieved June 30, 2016.
  21. Monte Nesbitt; Jim Kamas; Larry Stein (2013). "Blueberries" (PDF). Texas A&M University, AgriLife Extension Service. Retrieved 27 April 2019.
  22. Longstroth M (2014). "Lowering the soil pH with sulfur" (PDF). Michigan State University. Archived from the original (PDF) on 2015-11-16. Retrieved 2015-08-24.
  23. Hayden RA (2001). "Fertilizing blueberries" (PDF). Purdue University, Department of Horticulture. Retrieved 5 September 2015.
  24. "Cornell fruit: berry diagnostic tool". Cornell University, Department of Horticulture. 2013. Retrieved 5 September 2015.
  25. "Where Are Blueberries Grown?". World Atlas. 25 April 2017. Retrieved 27 April 2019.
  26. Mitch Lies (31 December 2018). "Record year makes Oregon top blueberry producer". Capital Press. Salem, OR. Retrieved 27 April 2019.
  27. "Top 10 Blueberry Producing States In America". World Atlas. 2019. Retrieved 27 April 2019.
  28. "Home: Welcome to the Town of Hammonton". Town of Hammonton. 2013-09-11. Retrieved 2013-11-06.
  29. "The Beautiful Blueberry!". Pineypower.com. 2018. Retrieved 10 July 2018.
  30. "Hammonton Chamber of Commerce". Hammontonnj.us. 2018. Retrieved 10 July 2018.
  31. David E. Yarborough (February 2015). "Wild Blueberry Culture in Maine". Cooperative Extension: Maine Wild Blueberries, University of Maine. Retrieved 20 April 2016.
  32. "State Berry - Wild Blueberry". Secretary of State for Maine, Matthew Dunlap. 2007. Retrieved 8 July 2017.
  33. "Fruit and vegetable production, 2015 - Canada". Statistics Canada. 3 February 2016. Retrieved 18 May 2016.
  34. "British Columbia Blueberries". BC Blueberry Council. 2009. Retrieved 2013-11-06.
  35. Deschênes V (20 April 2016). "New Brunswick to become world's largest producer of wild blueberries". Government of New Brunswick, Department of Agriculture, Aquaculture and Fisheries. Retrieved 18 May 2016.
  36. Dorff E (30 November 2015). "Blueberry varieties - Canada. In: The changing face of the Canadian fruit and vegetable sector: 1941 to 2011". Statistics Canada. Retrieved 18 May 2016.
  37. Nova Scotia: Official emblems and symbols
  38. "Wild blueberry trivia". Wild Blueberry Producers Associations of Nova Scotia. 2016. Retrieved 18 May 2016.
  39. Gagnon A (2006). "Wild Blueberry Production Guide in a Context of Sustainable Development: Survey of the Wild Blueberry Industry in Québec" (PDF). Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec. Retrieved 4 February 2015.
  40. "Where blueberries grow". U.S. Highbush Blueberry Council. 2019. Retrieved 27 July 2020.
  41. "Australian Blueberry Growers' Association". Australianblueberries.com.au. Retrieved 2013-11-06.
  42. U.S. Department of Agriculture GAIN Report, Retrieved June 30, 2011
  43. Pirovano, Francisco (12 January 2005). "Argentina Blueberries Voluntary 2005". GAIN Report. Foreign Agricultural Service. Retrieved 22 June 2009.
  44. "List of Goods Produced by Child Labor or Forced Labor". dol.gov.
  45. "Canadian blueberries". Agriculture and Agri-Food Canada, Government of Canada. 9 August 2019. Retrieved 21 February 2020.
  46. "Blueberries: transitioning from wild to cultivated production". Charlottetown Research and Development Centre, Agriculture and Agri-Food Canada, Government of Canada. 31 January 2018. Retrieved 18 March 2019.
  47. Government of Canada, Canadian Food Inspection Agency (2018-03-02). "Grades and Requirements for Blueberries; In: Canadian Grade Compendium; Volume 2 – Fresh Fruit or Vegetables". inspection.gc.ca. Retrieved 2019-07-12.
  48. "Catching the Toxic Drift: How Pesticides Used in the Blueberry Industry Threaten Our Communities, Our Water and the Environment". Environment Maine. 2005-08-16. Retrieved 2011-10-11.

Further reading
  • Retamales, J. B., Hancock, J. F. (2012). Blueberries (Crop Production Science in Horticulture). CABI. ISBN 978-1-84593-826-0
  • Sumner, Judith (2004). American Household Botany: A History of Useful Plants, 1620–1900. Timber Press. p. 125. ISBN 0-88192-652-3.
  • Wright, Virginia (2011). The Wild Blueberry Book. Down East Books. ISBN 978-0-89272-939-5.
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