Shoshani, Jeheskel; Ferretti, Marco P.; Lister, Adrian M.; Agenbroad, Larry D.; Saegusa, Haruo; Mol, Dick; Takahashi, Keiichi (2007). «Relationships within the Elephantinae using hyoid characters». Quaternary International. 169-170: 174-185. doi:10.1016/j.quaint.2007.02.003.