APA (7th ed.) Citation

Leonard, E. C. (1927). North American species of Scutellaria. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Leonard, Emery C. North American Species of Scutellaria. [Place of publication not identified]: U.S. Government Printing Office, 1927.

MLA (9th ed.) Citation

Leonard, Emery C. North American Species of Scutellaria. U.S. Government Printing Office, 1927.