Lean, Michael E.J. (2015). "Principles of Human Nutrition". Medicine. 43 (2): 61–65. doi:10.1016/j.mpmed.2014.11.009.
Melina, Vesanto; Craig, Winston; Levin, Susan (December 2016). "Position of the Academy of Nutrition and Dietetics: Vegetarian Diets". Journal of the Academy of Nutrition and Dietetics. 116 (12): 1970–1980. doi:10.1016/j.jand.2016.09.025.