APA (7th ed.) Citation

United States. Postmaster General. (1928). Requisitions for unprinted precanceled stamped envelopes. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Requisitions for Unprinted Precanceled Stamped Envelopes. Washington: U.S. GPO, 1928.

MLA (9th ed.) Citation

United States. Postmaster General. Requisitions for Unprinted Precanceled Stamped Envelopes. U.S. GPO, 1928.

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