APA استشهاد

Ritchie, C. (2003). Operating systems.-3rd ed (3rd ed.). BPB.

استشهاد بنمط شيكاغو

Ritchie, Collin. Operating Systems.-3rd Ed. 3rd ed. New Delhi: BPB, 2003.

MLA استشهاد

Ritchie, Collin. Operating Systems.-3rd Ed. 3rd ed. BPB, 2003.