Ashley, M.V.; Norman, J.E.; Stross, L. (1996). »Phylogenetic analysis of the perissodactyl family tapiridae using mitochondrial cytochrome c oxidase (COII) sequences«. Mammal Evolution. Zv. 3, št. 4. str. 315–326. doi:10.1007/BF02077448.
Voss, Robert S.; Helgen, Kristofer M.; Jansa, Sharon A. (2014). »Extraordinary claims require extraordinary evidence: a comment on Cozzuol et al. (2013)«. Journal of Mammalogy. Zv. 95, št. 4. str. 893–898. doi:10.1644/14-MAMM-A-054.