APA (7th ed.) Citation

United States. National Recovery Administration. (1935). Work Materials No. 18: Content of Code Histories. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Recovery Administration. Work Materials No. 18: Content of Code Histories. [Washington]: [s.n.], 1935.

MLA (9th ed.) Citation

United States. National Recovery Administration. Work Materials No. 18: Content of Code Histories. [s.n.], 1935.