APA (7th ed.) Citation

United States. Patent Documentation Organizations. (1991). Manual of classification. U.S. Dept. of Commerce, Patent and Trademark Office, Documentation Organizations.

Chicago Style (17th ed.) Citation

United States. Patent Documentation Organizations. Manual of Classification. Washington, D.C.: U.S. Dept. of Commerce, Patent and Trademark Office, Documentation Organizations, 1991.

MLA (9th ed.) Citation

United States. Patent Documentation Organizations. Manual of Classification. U.S. Dept. of Commerce, Patent and Trademark Office, Documentation Organizations, 1991.