APA (7th ed.) Citation

United States National Museum & Williston, S. W. (1886). Synopsis of North American Syrphidae. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States National Museum and Samuel Wendell Williston. Synopsis of North American Syrphidae. [Place of publication not identified]: U.S. Government Printing Office, 1886.

MLA (9th ed.) Citation

United States National Museum and Samuel Wendell Williston. Synopsis of North American Syrphidae. U.S. Government Printing Office, 1886.