1. 1918 Practical anatomy of the rabbit, 2nd edition, pp. 256-257. Univ. Toronto Press.
2. and 1910 Text-book of zoology, 2nd edition, Vol. 2, pp. 464-465. MacMillan Co.
3. 1906 Morris's human anatomy, 4th edition, pp. 510-511; 556. P. Blakiston's Sons & Co., Phila.