1. Vergleichende Untersuchungen zur endocranialen Morphologie und zur craniocerebralen Topographie von Giraffe und Okapi (Mammalia, Paraxonia, Pecora, Giraffoidea);Amat Munoz;Morph. Jb.,1959
2. Étude de moulages endocraniens d'Hippopotames disparus;Anthony;Mémoires du Muséum national d'Histoire naturelle, N. S.,1948
3. The giant beaver, Castoroides, and the common beaver, Castor, in Nebraska;Barbour;Bull. Nebraska State Museum,1931
4. Brain: Aves;Burne,1902
5. Records and distribution of the fossil beaver;Cahn;Castoroides ohioensis. J. Mammalogy,1932