APA (7th ed.) Citation

United States. Patent Office. (1927). Rules of practice in Patent Office, revised Oct. 1, 1927. GPO.

Chicago Style (17th ed.) Citation

United States. Patent Office. Rules of Practice in Patent Office, Revised Oct. 1, 1927. [Washington]: GPO, 1927.

MLA (9th ed.) Citation

United States. Patent Office. Rules of Practice in Patent Office, Revised Oct. 1, 1927. GPO, 1927.