Gaya APA
Leeburg, V., Purvis, P.
(1994).
Using WordPerfect 6.0 for Dos
.
San Fransisco:
Mitcheil Mc Graw-Hill.
Gaya MLA
Leeburg, Verlene., Purvis, Peggy.
"Using WordPerfect 6.0 for Dos".
San Fransisco:
Mitcheil Mc Graw-Hill,
1994.
Text.