APA (7th ed.) Citation

United States. Postmaster General. (1932). Improper acceptance of envelopes as post cards at 1-cent rate. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Improper Acceptance of Envelopes as Post Cards at 1-cent Rate. Washington: U.S. GPO, 1932.

MLA (9th ed.) Citation

United States. Postmaster General. Improper Acceptance of Envelopes as Post Cards at 1-cent Rate. U.S. GPO, 1932.

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