APA (7th ed.) Citation

United States. Post Office Department. (1932). Air mail information. GPO.

Chicago Style (17th ed.) Citation

United States. Post Office Department. Air Mail Information. [Washington]: GPO, 1932.

MLA (9th ed.) Citation

United States. Post Office Department. Air Mail Information. GPO, 1932.

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