ブロントテリウム科
1 2 Jeremy J. Hooker, “Perissodactyla,” In: Kenneth D. Rose & David Archibald (eds.), The Rise of Placental Mammals: Origins and Relationships of the Major Extant Clades, Johns Hopkins University Press, 2005, Pages 199–214.
1 2 3 4 George Gaylord Simpson, “The Principles of Classification and a Classification of Mammals,” Bulletin of The American Museum of Natural History, Volume 85, American Museum of Natural History, 1945, Pages 1-350.
1 2 3 4 Malcolm C. McKenna & Susan K. Bell, Classification of Mammals: Above the Species Level, Columbia University Press, 1997.