APA (7th ed.) Citation

United States Postal Service, United States Postal Service. Document Control Division, & United States Postal Service. Corporate Publishing and Information Management. (1981). International mail manual. U.S. Postal Service.

Chicago Style (17th ed.) Citation

United States Postal Service, United States Postal Service. Document Control Division, and United States Postal Service. Corporate Publishing and Information Management. International Mail Manual. Washington, D.C.: U.S. Postal Service, 1981.

MLA (9th ed.) Citation

United States Postal Service, et al. International Mail Manual. U.S. Postal Service, 1981.