APA (7th ed.) Citation

United States. Post Office Department. (1937). Postal bulletin, Jan. 19, 1937. [s.n.].

Chicago Style (17th ed.) Citation

United States. Post Office Department. Postal Bulletin, Jan. 19, 1937. [Washington]: [s.n.], 1937.

MLA (9th ed.) Citation

United States. Post Office Department. Postal Bulletin, Jan. 19, 1937. [s.n.], 1937.

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