APA (7th ed.) Citation

United States. Postmaster General. (1931). Use of unnecessarily large envelopes. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Use of Unnecessarily Large Envelopes. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. Postmaster General. Use of Unnecessarily Large Envelopes. U.S. GPO, 1931.

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