APA (7th ed.) Citation

Smithsonian Institution. (1936). Two new species of hawks from Miocene of Nebraska. [s.n.].

Chicago Style (17th ed.) Citation

Smithsonian Institution. Two New Species of Hawks from Miocene of Nebraska. [Washington]: [s.n.], 1936.

MLA (9th ed.) Citation

Smithsonian Institution. Two New Species of Hawks from Miocene of Nebraska. [s.n.], 1936.