APA (7th ed.) Citation

United States. Postmaster General. (1926). Special delivery service with Switzerland effective at once. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Special Delivery Service with Switzerland Effective at Once. Washington: U.S. GPO, 1926.

MLA (9th ed.) Citation

United States. Postmaster General. Special Delivery Service with Switzerland Effective at Once. U.S. GPO, 1926.

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