APA (7th ed.) Citation

United States. Post Office Department. (1944). United States official postal guide: Monthly supplement to parts 1 and 2, 5th series; Vol. 4, No. 10. [s.n.].

Chicago Style (17th ed.) Citation

United States. Post Office Department. United States Official Postal Guide: Monthly Supplement to Parts 1 and 2, 5th Series; Vol. 4, No. 10. [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, 5th Series; Vol. 4, No. 10. [s.n.], 1944.