USDA Center for Nutrition Policy & Promotion. How much food from the protein food group is needed daily? ChoosMyPlate.gov. http://www.choosemyplate.gov/food-groups/protein-foods-amount.pdf. Accessed 4/26/2015.
USDA Center for Nutrition Policy & Promotion. Protein foods. ChooseMyPlate.gov. http://www.choosemyplate.gov/food-groups/protein-foods.html. Accessed 4/26/2015.
Harvard School of Public Health. Protein: The Bottom Line. The Nutrition Source. http://www.hsph.harvard.edu/nutritionsource/protein/. Accessed Mar. 2013.
USDA Center for Nutrition Policy & Promotion. What Foods Are in the Protein Foods Group? ChooseMyPlate. http://www.choosemyplate.gov/food-groups/protein-foods.html. Accessed Mar. 2013.