APA (7th ed.) Citation

United States. Patent Office. (1929). Manual of classification of patents. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States. Patent Office. Manual of Classification of Patents. [Washington?]: U.S. Government Printing Office, 1929.

MLA (9th ed.) Citation

United States. Patent Office. Manual of Classification of Patents. U.S. Government Printing Office, 1929.