APA (7th ed.) Citation

United States. Postmaster General. (1925). Short-paid post cards. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Short-paid Post Cards. Washington: U.S. GPO, 1925.

MLA (9th ed.) Citation

United States. Postmaster General. Short-paid Post Cards. U.S. GPO, 1925.

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