1. Flourens, P. Memoires d’Anatomie et Physiologie Comparees. p. 30. Paris. 1884.(Original not available for examination: cited in Bergman, H. D., and Dukes, H. H. An Experimental Study of the Mechanism of Eegurgitation in Rumination. J. Am. Vet. Med. Assoc, 69: 600. 1926.)
2. The Passage of Fluids Through the Ruminant Stomach;Boss;Australian Vet. J.,1931
3. Physiology of the Ruminant Stomach (Bovine);Schalk;N. Dakota Agr. Expt. Sta., Bull.,1928
4. Snedecok, G. W. Statistical Methods. 4th ed. Iowa State College Press, Ames. 1946.
5. Studies on Deglutition in Sheep;Watson,1944