APA (7th ed.) Citation

United States. Patent Office. (1917). Classification of patents. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Patent Office. Classification of Patents. Washington: U.S. GPO, 1917.

MLA (9th ed.) Citation

United States. Patent Office. Classification of Patents. U.S. GPO, 1917.

Warning: These citations may not always be 100% accurate.