APA (7th ed.) Citation

United States. Postmaster General & Harding, W. G. (1930). Change in design of 1-cent postage stamp, portrait of Harding. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General and Warren G. Harding. Change in Design of 1-cent Postage Stamp, Portrait of Harding. Washington: U.S. GPO, 1930.

MLA (9th ed.) Citation

United States. Postmaster General and Warren G. Harding. Change in Design of 1-cent Postage Stamp, Portrait of Harding. U.S. GPO, 1930.