APA (7th ed.) Citation

United States Postal Service. (1981). The Americana series: Issues of 1975-1981. U.S. Postal Service.

Chicago Style (17th ed.) Citation

United States Postal Service. The Americana Series: Issues of 1975-1981. [Washington, D.C.?]: U.S. Postal Service, 1981.

MLA (9th ed.) Citation

United States Postal Service. The Americana Series: Issues of 1975-1981. U.S. Postal Service, 1981.

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