APA (7th ed.) Citation

Simpson, G. G. (1925). A Mesozoic mammal skull from Mongolia.

Chicago Style (17th ed.) Citation

Simpson, George Gaylord. A Mesozoic Mammal Skull from Mongolia. New York, N.Y, 1925.

MLA (9th ed.) Citation

Simpson, George Gaylord. A Mesozoic Mammal Skull from Mongolia. 1925.