APA (7th ed.) Citation

United States. Postmaster General. (1932). Increased air-mail rate to Canada, Newfoundland (including Labrador), and Mexico. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Increased Air-mail Rate to Canada, Newfoundland (including Labrador), and Mexico. Washington: U.S. GPO, 1932.

MLA (9th ed.) Citation

United States. Postmaster General. Increased Air-mail Rate to Canada, Newfoundland (including Labrador), and Mexico. U.S. GPO, 1932.

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