APA (7th ed.) Citation

United States. Post Office Department. (1944). United States official Postal guide, monthly supplement to parts 1 and 2, fifth series, vol. 4, no. 7; Jan. 1944. [s.n.].

Chicago Style (17th ed.) Citation

United States. Post Office Department. United States Official Postal Guide, Monthly Supplement to Parts 1 and 2, Fifth Series, Vol. 4, No. 7; Jan. 1944. [Washington]: [s.n.], 1944.

MLA (9th ed.) Citation

United States. Post Office Department. United States Official Postal Guide, Monthly Supplement to Parts 1 and 2, Fifth Series, Vol. 4, No. 7; Jan. 1944. [s.n.], 1944.