APA (7th ed.) Citation

Simpson, G. G. (1932). New or little-known ungulates from the Pyrotherium and Colpodon beds of Patagonia. The American Museum of Natural History.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. New or Little-known Ungulates from the Pyrotherium and Colpodon Beds of Patagonia. New York City: The American Museum of Natural History, 1932.

MLA (9th ed.) Citation

Simpson, George Gaylord. New or Little-known Ungulates from the Pyrotherium and Colpodon Beds of Patagonia. The American Museum of Natural History, 1932.