APA (7th ed.) Citation

United States. Postmaster General. (1926). Supervision of city delivery service. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Supervision of City Delivery Service. Washington: U.S. GPO, 1926.

MLA (9th ed.) Citation

United States. Postmaster General. Supervision of City Delivery Service. U.S. GPO, 1926.

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