Szalay, Frederick S. (). „Classification of Mammals above the Species Level: Review”. Journal of Vertebrate Paleontology. 19 (1): 191–195. doi:10.1080/02724634.1999.10011133. JSTOR4523980.
Szalay, Frederick S. (). „Classification of Mammals above the Species Level: Review”. Journal of Vertebrate Paleontology. 19 (1): 191–195. doi:10.1080/02724634.1999.10011133. JSTOR4523980.