Shoshani,J.; Walter, R. C.; Abraha, M.; Berhe, S.; Tassy, P.; Sanders, W. J.; Marchant, G.; Libsekal, Y.; Ghirmai, T.; Zinner, D. (24 juli 2007). ”A proboscidean from the late Oligocene of Eritrea, a "missing link" between early Elephantiformes and Elephantimorpha, and biogeographic implications” (på engelska). Proceedings of the National Academy of Sciences 103 (46): sid. 17296–17301. doi:10.1073/pnas.0603689103. ISSN0027-8424.
Shoshani,J.; Walter, R. C.; Abraha, M.; Berhe, S.; Tassy, P.; Sanders, W. J.; Marchant, G.; Libsekal, Y.; Ghirmai, T.; Zinner, D. (24 juli 2007). ”A proboscidean from the late Oligocene of Eritrea, a "missing link" between early Elephantiformes and Elephantimorpha, and biogeographic implications” (på engelska). Proceedings of the National Academy of Sciences 103 (46): sid. 17296–17301. doi:10.1073/pnas.0603689103. ISSN0027-8424.