APA (7th ed.) Citation

United States. Post Office Department. (1932). Use of precanceled stamps on holiday mail. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Use of Precanceled Stamps on Holiday Mail. [Washington]: GPO, 1932.

MLA (9th ed.) Citation

United States. Post Office Department. Use of Precanceled Stamps on Holiday Mail. GPO, 1932.

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