APA (7th ed.) Citation

United States. Postmaster General. (1926). Special delivery service with Belgium, Denmark, France, Netherlands, Norway, and Sweden, effective Oct. 1, 1926. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Special Delivery Service with Belgium, Denmark, France, Netherlands, Norway, and Sweden, Effective Oct. 1, 1926. Washington: U.S. GPO, 1926.

MLA (9th ed.) Citation

United States. Postmaster General. Special Delivery Service with Belgium, Denmark, France, Netherlands, Norway, and Sweden, Effective Oct. 1, 1926. U.S. GPO, 1926.