Mihlbachler, Matthew Christian (2005). Phylogenetic systematics of the Brontotheriidae (Mammalia, Perissodactyla) (Thesis). OCLC79487069. ProQuest305015315.[page needed]
Mihlbachler, Matthew Christian (2005). Phylogenetic systematics of the Brontotheriidae (Mammalia, Perissodactyla) (Thesis). OCLC79487069. ProQuest305015315.[page needed]