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Peters, Christian J.; Picardy, Jamie; Darrouzet-Nardi, Amelia F.; Wilkins, Jennifer L.; Griffin, Timothy S.; Fick, Gary W. «Carrying capacity of U.S. agricultural land: Ten diet scenarios». Elementa: Science of the Anthropocene, 4, 22-07-2016, pàg. 000116. DOI: 10.12952/journal.elementa.000116.
Barr, Susan I.; Gwen E. Chapman «Perceptions and practices of self-defined current vegetarian and nonvegetarian women». Journal of the American Dietetic Association, 102, 3, 3-2002, pàg. 354–360. DOI: 10.1016/S0002-8223(02)90083-0. PMID: 11902368 [Consulta: 9 juliol 2010].
Barr, Susan I.; Gwen E. Chapman «Perceptions and practices of self-defined current vegetarian and nonvegetarian women». Journal of the American Dietetic Association, 102, 3, 3-2002, pàg. 354–360. DOI: 10.1016/S0002-8223(02)90083-0. PMID: 11902368 [Consulta: 9 juliol 2010].
One of the most frequently asked questions is: Why are some cheeses labeled as "vegetarian cheese"? Why wouldn't cheese be vegetarian? What is rennet? «Frequently Asked Questions — Food Ingredients». Vegetarian Resource Group. [Consulta: 9 juliol 2010].