APA (7th ed.) Citation

United States. Postmaster General & Washington, G. (1931). Special request bicentennial envelopes not yet available. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General and George Washington. Special Request Bicentennial Envelopes Not yet Available. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. Postmaster General and George Washington. Special Request Bicentennial Envelopes Not yet Available. U.S. GPO, 1931.