WordPerfect Corp. , 1990
Buku Teks
Dyson, Steve, author
Osborne McGraw-Hill, 1993
Buku Teks
Young, Margaret Levine, author
IDG Books Wordwide, 1993
Buku Teks
McClure, Rhyder, author
Brady, 1990
Buku Teks
Christopher, author
Dinastindo, 1992
Buku Teks