APA (7th ed.) Citation

United States. Postmaster General. (1925). Parcel post to Poland. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Postmaster General. Parcel Post to Poland. Washington: U.S. GPO, 1925.

MLA (9th ed.) Citation

United States. Postmaster General. Parcel Post to Poland. U.S. GPO, 1925.

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