The Elements of Geology [online]. Globusz, [cit. 2008-03-11]. Dostupné online. Archivované 2008-03-09 z originálu.
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JANIS, Kathleen M.. Evolution of Tertiary Mammals of North America: Volume 1, Terrestrial Carnivores, Ungulates, and Ungulate Like Mammals. [s.l.] : Cambridge University Press, 1998. 703 s. Dostupné online.ISBN 978-0-521-35519-3. S. 73-74.
ZACHOS, Frank; ASHER, Robert. Mammalian Evolution, Diversity and Systematics. [s.l.] : Walter de Gruyter GmbH & Co KG, 2018. 392 s. Dostupné online.ISBN 978-3-11038254-9.
PREVOSTI, Francisco J.; FORASIEPI, Analía M.. Evolution of South American Mammalian Predators During the Cenozoic: Paleobiogeographic and Paleoenvironmental Contingencies. [s.l.] : Springer, 2018. 196 s. Dostupné online.ISBN 978-3-319-03701-1. S. 3.
