APA (7th ed.) Citation

United States. Post Office Department. (1945). Postal bulletin, June 8, 1945. [s.n.].

Chicago Style (17th ed.) Citation

United States. Post Office Department. Postal Bulletin, June 8, 1945. [Washington]: [s.n.], 1945.

MLA (9th ed.) Citation

United States. Post Office Department. Postal Bulletin, June 8, 1945. [s.n.], 1945.