APA (7th ed.) Citation

United States. Post Office Department. (1933). U.S. Official Postal Guide, 4th Series; Jan. 1933. [s.n.].

Chicago Style (17th ed.) Citation

United States. Post Office Department. U.S. Official Postal Guide, 4th Series; Jan. 1933. [Washington]: [s.n.], 1933.

MLA (9th ed.) Citation

United States. Post Office Department. U.S. Official Postal Guide, 4th Series; Jan. 1933. [s.n.], 1933.