P. Tassy. The classification of Proboscidea: how many cladistic classifications?. „Cladistics”. 4 (1), s. 43–57, 1988. DOI: 10.1111/j.1096-0031.1988.tb00467.x. (ang.).
N.S. Upham, C.J. Burgin, J. Widness, M.A. Becker, H. Handika, J.S. Zijlstra & D.G. Huckaby: The ASM Mammal Diversity Database. [w:] ASM Mammal Diversity Database (Version 2.2) [on-line]. American Society of Mammalogists. [dostęp 2025-06-18]. (ang.).