1918. Observations on the genus Lysorophus Cope. Ann. Mag. Nat. Hist., (9)2:232-239.
Bystrow, A. P.
1938. Dvinosaurus als neotenische Form der Stegocephalen. Acta Zool., 19:209-295.
Case, E. C.
1935. Description of a collection of associated skeletons of Trimerorhachis. Contrib. Mus. Pal. Univ. Michigan, 4:227-274.
Cope, E. D.
1889. The Batrachia of North America. Bull. U. S. Nat. Mus., 34:1-525.
de Beer, G. R.
1937. The development of the vertebrate skull. Pp. xxiii + 552. Oxford, Clarendon Press.
de Villiers, C. G. S.