These are the sources from which the information of this webpage was gathered. They have been cited in APA format.
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Britton, N H. (1908). North American trees being descriptions and illustrations of the trees growing independently of cultivation in north America, north of Mexico, and the west indies. New York, NY: Henry Holt and Company.
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procyanidins: Screening for b1 to b8 and semisynthetic preparation of
b3, b4, b6, and b8 from a polymeric procyanidin fraction of white willow
bark (salix alba). Journal of agricultural and food chemistry, 58(13),
7820-7830.
Mitchell, Alan. (1974). Trees of Britain and northern Europe. Boston, MA: Houghton Mifflin Company.
Plants Profile for Salix alba 2011. <URL: http://plants.usda.gov/java/profile?symbol=SAAL2>. Accessed 1 March 2011.
Preston, R J. (1976). North American trees. Ames, IA: The Iowa State
University Press.
Raiciu, A, Mihele, D, Ionita, C 2010. Antimicrobial activity of ribes
nigrum, rosmarinus officinalis, betula pubescens, salix alba, vaccinium
myrtillus gemoderivatives. Farmacia, 58(6), 735-748.
Sargent, C S. (1961). Manual of the trees of north America . New York,
NY: Doer Publications, Inc.
White Willow <URL:
http://www.greatvistachemicals.com/herbal-supplements/white-willow.html>.
Acesseed 3 March 2011.
Willow Bark 2011. <URL:
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February 2011.