APA (7th ed.) Citation

United States. Post Office Department. (1926). Internal revenue documentary stamps. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Internal Revenue Documentary Stamps. [Washington]: GPO, 1926.

MLA (9th ed.) Citation

United States. Post Office Department. Internal Revenue Documentary Stamps. GPO, 1926.

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