APA Style
WORDPERFECT for IBM Personal Computers Version 5.0. (1988).
USA:
Wordperfect.
Chicago Style
WORDPERFECT for IBM Personal Computers Version 5.0.
.
USA:
Wordperfect,
1988.
Text.
MLA Style
WORDPERFECT for IBM Personal Computers Version 5.0.
.
USA:
Wordperfect,
1988.
Text.
Turabian Style
WORDPERFECT for IBM Personal Computers Version 5.0.
USA:
Wordperfect,
1988.
Print.