APA (7th ed.) Citation

Ritchie. (1992). Operating systems: Incorporating UNIX and MS-DOS. DP Pubs.

Chicago Style (17th ed.) Citation

Ritchie. Operating Systems: Incorporating UNIX and MS-DOS. London: DP Pubs, 1992.

MLA (8th ed.) Citation

Ritchie. Operating Systems: Incorporating UNIX and MS-DOS. DP Pubs, 1992.

Warning: These citations may not always be 100% accurate.