Reference
Ursula B. Göhlich (2007): 9. Gomphotheres (Proboscidea, Mammalia). In: Daxner-Höck, Gudrun ed. Oligocene-Miocene Vertebrates from the Valley of Lakes (Central Mongolia): Morphology, phylogenetic and stratigraphic implications – Annalen des Naturhistorischen Museums in Wien – 108A: 271 - 289.