APA (7th ed.) Citation

United States. Postmaster General. (1931). Rules for sale of stamped envelopes, effective Jan. 2, 1932. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Rules for Sale of Stamped Envelopes, Effective Jan. 2, 1932. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. Postmaster General. Rules for Sale of Stamped Envelopes, Effective Jan. 2, 1932. U.S. GPO, 1931.

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