Gaya APA

Putrajaya, I., Widodo, D. (1994). Operating system & utility MS DOS Version 6.20 (1994). : Yogyakarta : Andi 0ff.,.

Gaya MLA

Putrajaya, Ichwani., Widodo, D.Wahyu. "Operating system & utility MS DOS Version 6.20". 1994 : Yogyakarta : Andi 0ff.,, 1994. Text.