APA (7th ed.) Citation

United States Postal Service. (1994). Postal facts. United States Postal Service.

Chicago Style (17th ed.) Citation

United States Postal Service. Postal Facts. [Washington, D.C.]: United States Postal Service, 1994.

MLA (9th ed.) Citation

United States Postal Service. Postal Facts. United States Postal Service, 1994.

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