APA (7th ed.) Citation

United States. Postmaster General. (1930). Use of precanceled postage stamps on 1st-class matter. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Use of Precanceled Postage Stamps on 1st-class Matter. Washington: U.S. GPO, 1930.

MLA (9th ed.) Citation

United States. Postmaster General. Use of Precanceled Postage Stamps on 1st-class Matter. U.S. GPO, 1930.

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