Knight, C. A.; Dutcher, R. A.; Guerrant, N. B.; Bechdel, S. I. (1 May 1940). "Destruction of Ascorbic Acid in the Rumen of the Dairy Cow". Proceedings of the Society for Experimental Biology and Medicine. 44 (1): 90–93. doi:10.3181/00379727-44-11364. ISSN0037-9727. S2CID85146536.
Schalk, A. F. (Arthur Frederick); Amadon, R. S. (1928). "Physiology of the ruminant stomach (bovine)". Food and Agriculture Organization of the United Nations. Agricultural Experiment Station, North Dakota Agricultural College. Retrieved 13 March 2020.
Knight, C. A.; Dutcher, R. A.; Guerrant, N. B.; Bechdel, S. I. (1 May 1940). "Destruction of Ascorbic Acid in the Rumen of the Dairy Cow". Proceedings of the Society for Experimental Biology and Medicine. 44 (1): 90–93. doi:10.3181/00379727-44-11364. ISSN0037-9727. S2CID85146536.
Knight, C. A.; Dutcher, R. A.; Guerrant, N. B.; Bechdel, S. I. (1 May 1940). "Destruction of Ascorbic Acid in the Rumen of the Dairy Cow". Proceedings of the Society for Experimental Biology and Medicine. 44 (1): 90–93. doi:10.3181/00379727-44-11364. ISSN0037-9727. S2CID85146536.