APA (7th ed.) Citation

United States. Postmaster General. (1932). Card notices concerning mail subject to 3-cent rate when returned under cover to issuing post office. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Card Notices Concerning Mail Subject to 3-cent Rate When Returned Under Cover to Issuing Post Office. Washington: U.S. GPO, 1932.

MLA (9th ed.) Citation

United States. Postmaster General. Card Notices Concerning Mail Subject to 3-cent Rate When Returned Under Cover to Issuing Post Office. U.S. GPO, 1932.