APA (7th ed.) Citation

Sobell, M. G. (1989). A practical guide to the UNIX System (2nd ed.). The Benjamin/Cummings Publishing.

Chicago Style (17th ed.) Citation

Sobell, Mark G. A Practical Guide to the UNIX System. 2nd ed. California: The Benjamin/Cummings Publishing, 1989.

MLA (9th ed.) Citation

Sobell, Mark G. A Practical Guide to the UNIX System. 2nd ed. The Benjamin/Cummings Publishing, 1989.