APA (7th ed.) Citation

Howell, A. H. (1918). Revision of the American flying squirrels. Govt. print. off.

Chicago Style (17th ed.) Citation

Howell, Arthur H. Revision of the American Flying Squirrels. Washington: Govt. print. off, 1918.

MLA (9th ed.) Citation

Howell, Arthur H. Revision of the American Flying Squirrels. Govt. print. off, 1918.