APA (7th ed.) Citation

United States. Postmaster General. (1929). Schedule of Mexican air routes. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Schedule of Mexican Air Routes. Washington: U.S. GPO, 1929.

MLA (9th ed.) Citation

United States. Postmaster General. Schedule of Mexican Air Routes. U.S. GPO, 1929.

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