Sinclair، Upton (1911). "The Use of Meat". The Fasting Cure. Digitized by Harvard University. New York: Mitchell Kennerly. ص. 86–104. ISBN:9781852286095. مؤرشف من الأصل في 2021-10-31.
Sinclair، Upton (1911). "The Use of Meat". The Fasting Cure. Digitized by Harvard University. New York: Mitchell Kennerly. ص. 86–104. ISBN:9781852286095. مؤرشف من الأصل في 2021-10-31.