APA (7th ed.) Citation

United States. Bureau of Biological Survey. (1938). Revision of North American ground squirrels, with classification of North American Sciuridae. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Biological Survey. Revision of North American Ground Squirrels, with Classification of North American Sciuridae. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. Bureau of Biological Survey. Revision of North American Ground Squirrels, with Classification of North American Sciuridae. [s.n.], 1938.