Wang, Xiaofeng; Tedford, Richard H.. (1996-06-13). «Canidae»The Terrestrial Eocene-Oligocene Transition in North America (Cambridge University Press): 433–452. (Noiz kontsultatua: 2023-11-09).
Macdonald, David W.. (2020-11-25). «Conservation of Mammals»Encyclopedia of the UN Sustainable Development Goals (Springer International Publishing): 174–189. (Noiz kontsultatua: 2023-11-09).