APA (7th ed.) Citation

United States. Patent Office. (1944). Classification bulletin of the United States Patent Office. [s.n.].

Chicago Style (17th ed.) Citation

United States. Patent Office. Classification Bulletin of the United States Patent Office. [Washington]: [s.n.], 1944.

MLA (9th ed.) Citation

United States. Patent Office. Classification Bulletin of the United States Patent Office. [s.n.], 1944.

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