APA (7th ed.) Citation

United States. Patent and Trademark Office & United States. Patent and Trademark Office. Office of Classification Support. Index to the U.S. patent classification. U.S. Dept. of Commerce, Patent and Trademark Office : [Supt. of Docs., U.S. G.P.O., distributor.

Chicago Style (17th ed.) Citation

United States. Patent and Trademark Office and United States. Patent and Trademark Office. Office of Classification Support. Index to the U.S. Patent Classification. [Washington, D.C.]: U.S. Dept. of Commerce, Patent and Trademark Office : [Supt. of Docs., U.S. G.P.O., distributor.

MLA (9th ed.) Citation

United States. Patent and Trademark Office and United States. Patent and Trademark Office. Office of Classification Support. Index to the U.S. Patent Classification. U.S. Dept. of Commerce, Patent and Trademark Office : [Supt. of Docs., U.S. G.P.O., distributor.