APA (7th ed.) Citation

Simpson, G. G. (1937). Notes on the Clark Fork, Upper Paleocene, fauna.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. Notes on the Clark Fork, Upper Paleocene, Fauna. New York, N.Y, 1937.

MLA (9th ed.) Citation

Simpson, George Gaylord. Notes on the Clark Fork, Upper Paleocene, Fauna. 1937.