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20.Nutritive Value of Foods, United States Department of Agriculture, Agricultural Research Service, Home and Garden Bulletin Number 72. May be accessed at: https://www.ars.usda.gov/SP2UserFiles/Place/12354500/Data/SR25/nutrlist/sr25w203.pdf and http://www.nal.usda.gov/fnic/foodcomp/Data/HG72/hg72_2002.pdf
21.Australian Sports Commission. Supplements and sports foods, Burke and Deakin (eds). Clinical Sports Nutrition, 4th ED, McGraw Hill, Sydney 2010. http://www.ausport.gov.au/