Cita APA

United States Postal Service. (1993). 1993 [i.e. one thousand, nine hundred and ninety three] commemorative stamp collection. U.S. Postal Service.

Citación estilo Chicago

United States Postal Service. 1993 [i.e. One Thousand, Nine Hundred and Ninety Three] Commemorative Stamp Collection. México: U.S. Postal Service, 1993.

Cita MLA

United States Postal Service. 1993 [i.e. One Thousand, Nine Hundred and Ninety Three] Commemorative Stamp Collection. U.S. Postal Service, 1993.

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