APA (7th ed.) Citation

Simpson, G. G. (1929). Third contribution to the Fort Union fauna at Bear Creek, Montana. The American Museum of Natural History.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. Third Contribution to the Fort Union Fauna at Bear Creek, Montana. New York City: The American Museum of Natural History, 1929.

MLA (9th ed.) Citation

Simpson, George Gaylord. Third Contribution to the Fort Union Fauna at Bear Creek, Montana. The American Museum of Natural History, 1929.