1. The physiology of domestic animals First Edition;Dukes,1934
2. Kick, C. H., Gerlaugh, Paul, Schalk, A. F., and Silver, E. A. Ohio Agr. Exp. Sta. Bull. 592, p. 105. 1938.
3. Stalfoks, Harry. The reaction of the contents of the first stomach and of the excreta. Arch. Wiss. prakt. Tierh. 54: 525-526. 1926. Chem. Abstr. 21(14): 2303. 1927.
4. Beitrage zur Physiologie der Verdauung;Schwarz;Pflügers Arch.,1926