Dyfyniad APA

United States Postal Service. (1994). 1994 [i.e. one thousand, nine hundred and ninety four] commemorative stamp collection. U.S. Postal Service.

Dyfyniad Arddull Chicago

United States Postal Service. 1994 [i.e. One Thousand, Nine Hundred and Ninety Four] Commemorative Stamp Collection. México: U.S. Postal Service, 1994.

Dyfyniad MLA

United 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.