1. de Beaumont, G. (1964): Remarque sur la classification des Felidae. — Eclogae geol. helv.,57 (2): 837–845; Basel.
2. Carlsson, A. (1911): überCryptoprocta ferox. — Zool. Jb.,30: 419–470, 3 pl.; London.
3. Chen Guanfang &Wu Wenyu (1976): Miocene Mammals from Cixian County, Province Hobei. — Vertebrata Palasiatica,14 (1): 6–15, 2 pis.; Peking.
4. Gregory, W. K. &Hellman, M. (1939): On the Evolution and Major Classification of the Civets (Viverridae) and Allied Fossil and Recent Carnivora: A Phylogenetic Study of the Skull and Dentition. — Amer. Philosoph. Soc.,81 (3): 309–392, 33 figs., 6 pis.
5. Hendey, Q.B. (1978): Late Tertiary Hyaenidae from Langebaanweg, South Africa, and their Relevance to the Phylogeny of the Family. — Ann. S. Afr. Mus.,76 (7): 265–297, 11 figs., 4 tabi.; Cape Town.