APA (7th ed.) Citation

Ritchie, C. (1995). Operating systems: Incorporating UNIX and MS-DOS (Second edition.). BPB Publications.

Chicago Style (17th ed.) Citation

Ritchie, C. Operating Systems: Incorporating UNIX and MS-DOS. Second edition. New Delhi: BPB Publications, 1995.

MLA (8th ed.) Citation

Ritchie, C. Operating Systems: Incorporating UNIX and MS-DOS. Second edition. BPB Publications, 1995.