APA (7th ed.) Citation

United States. Postmaster General. (1930). List of foreign post offices whose names have been changed within last few years. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. List of Foreign Post Offices Whose Names Have Been Changed Within Last Few Years. Washington: U.S. GPO, 1930.

MLA (9th ed.) Citation

United States. Postmaster General. List of Foreign Post Offices Whose Names Have Been Changed Within Last Few Years. U.S. GPO, 1930.