Beitz, Donald C., Louise A. Berner, Louise A. Berner, Gerald F. Combs, R. Gaurth Hansen, Richard T. Lovell, Richard L. Willham, y Carol T. Windham. 1997. «Contribution of Animal Products to Healthful Diets». Council for Agricultural Science and Technology (CAST), octubre. https://doi.org/10.62300/syrvpb14.