APA Style

Noble, D, F., Illg, K, C. (1985). Using wordperfect revised edition includes versions 4.0 and 4.1 . USA: Kementerian Komunikasi dan Informatika RI.

MLA Style

Noble, David, F.., Illg, Karl, C.. "Using wordperfect revised edition includes versions 4.0 and 4.1". USA: Kementerian Komunikasi dan Informatika RI, 1985. Text.