Shoshani, J.; Ferretti, M. P.; Lister, A. M.; Agenbroad, L. D.; Saegusa, H.; Mol, D.; Takahashi, K. Relationships within the Elephantinae using hyoid characters. Quaternary International. 2007,. 169-170: 174–185. Bibcode:2007QuInt.169..174S. doi:10.1016/j.quaint.2007.02.003.
Shoshani, J.; Ferretti, M. P.; Lister, A. M.; Agenbroad, L. D.; Saegusa, H.; Mol, D.; Takahashi, K. Relationships within the Elephantinae using hyoid characters. Quaternary International. 2007,. 169-170: 174–185. Bibcode:2007QuInt.169..174S. doi:10.1016/j.quaint.2007.02.003.