APA (7th ed.) Citation

United States. Postmaster General. (1932). Return of undeliverable postal cards bearing return card and pledge. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Return of Undeliverable Postal Cards Bearing Return Card and Pledge. Washington: U.S. GPO, 1932.

MLA (9th ed.) Citation

United States. Postmaster General. Return of Undeliverable Postal Cards Bearing Return Card and Pledge. U.S. GPO, 1932.

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