United States Postal Service. (1994). 1994 [i.e. one thousand, nine hundred and ninety four] commemorative stamp collection. U.S. Postal Service.
Dyfyniad Arddull ChicagoUnited States Postal Service. 1994 [i.e. One Thousand, Nine Hundred and Ninety Four] Commemorative Stamp Collection. México: U.S. Postal Service, 1994.
Dyfyniad MLAUnited States Postal Service. 1994 [i.e. One Thousand, Nine Hundred and Ninety Four] Commemorative Stamp Collection. U.S. Postal Service, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.