APA (7th ed.) Citation

United States Postal Service. International mail manual. U.S. Postal Service.

Chicago Style (17th ed.) Citation

United States Postal Service. International Mail Manual. Arlington, Va.: U.S. Postal Service.

MLA (9th ed.) Citation

United States Postal Service. International Mail Manual. U.S. Postal Service.

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