APA (7th ed.) Citation

Groff & Weinberg. (1988). Understanding UNIX: A conceptual guide (2nd ed.). Tech Publications.

Chicago Style (17th ed.) Citation

Groff and Weinberg. Understanding UNIX: A Conceptual Guide. 2nd ed. Singapore: Tech Publications, 1988.

MLA (8th ed.) Citation

Groff and Weinberg. Understanding UNIX: A Conceptual Guide. 2nd ed. Tech Publications, 1988.

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