R. M. Nowak. 1979. North American Quaternary Canis. Monograph of the Museum of Natural History, University of Kansas 6:1-154 LINK:[1]Archived 2017-07-02 at the Wayback Machine
"Canis". www.utep.edu. Archived from the original on 2022-01-02. Retrieved 2021-03-13.
R. M. Nowak. 1979. North American Quaternary Canis. Monograph of the Museum of Natural History, University of Kansas 6:1-154 LINK:[1]Archived 2017-07-02 at the Wayback Machine