Eisler, MC, Lee, MRF, Tarlton, JF, Martin, GB, Beddington, J, Dungait, JAJ, Greathead, H, Liu, J, Mathew, S, Miller, H, Misselbrook, T, Murray, P, Vinod, VK, Van Saun, R and Winter, M 2014. Steps to sustainable livestock. Nature 507, 32–34.
FAO 2009. The State of Food and Agriculture:livestock in the balance. FAO, Rome. pp 166.
Milton, K 2003. The Critical Role Played by Animal Source Foods in Human (Homo) Evolution. The Journal of Nutrition 133, 3886S–3892S.