APA (7th ed.) Citation

United States. Post Office Department. (1928). New issue of 1-cent precanceled stamped envelopes. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. New Issue of 1-cent Precanceled Stamped Envelopes. [Washington]: GPO, 1928.

MLA (9th ed.) Citation

United States. Post Office Department. New Issue of 1-cent Precanceled Stamped Envelopes. GPO, 1928.

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