1. Bohlin, B. 1942. The fossil mammals from the Tertiary deposit of Tuben-buluk, Western Kansu. Part I. Insectivora and Lagomorpha. Palaeont. sinica (n.s.) C, 8a: 1–110.
2. Butler, P. M. 1956. The ontogeny of molar pattern. Biol. Rev. 31: 30–70.
3. Butler, P. M. 1973. Molar wear facets of early Tertiary North American primates. Symp. 4th. int. Cong. Primatol. 3: 1–27.
4. Butler, P. M. 1980. Functional aspects of the evolution of rodent molars. Palaeovertebrata Mém, Jubil. R. Lavocat: 249-262.
5. Butler, P. M. 1982. Directions of evolution in the mammalian dentition. In: Problems of Phylogenetic Reconstruction, K. A. Joysey and A. E. Friday, eds., pp. 235–244, Academic Press. London.