APA (7th ed.) Citation

United States. Postmaster General. (1931). C.O.D. service with Hungary, effective Feb. 1, 1931. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. C.O.D. Service with Hungary, Effective Feb. 1, 1931. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. Postmaster General. C.O.D. Service with Hungary, Effective Feb. 1, 1931. U.S. GPO, 1931.

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