Gaya APA
Putrajaya, I., Widodo, D, W.
(1994).
Operating system & utility MS DOS version 6.20
.
Yogyakarta:
Andi.
Gaya MLA
Putrajaya, Ichwani., Widodo, D., Wahyu.
"Operating system & utility MS DOS version 6.20".
Yogyakarta:
Andi,
1994.
Text.