APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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