BioStor
 | East African mammals in the United States National Museum. Part III. Primates, Artiodactyla, Perissodactyla, Proboscidea, and Hyracoidea N Hollister (1919) Bulletin United States National Museum 99: 1-164 |
 | A checklist of African mammals G M Allen (1939) Bulletin of the Museum of Comparative Zoology, Harvard 83: 1-763 |