APA (7th ed.) Citation

Groff, J. R., & Weinberg, P. N. (1988). Understanding Unix: A conceptual guide (2nd ed.). Que Corp..

Chicago Style (17th ed.) Citation

Groff, James R., and Paul N. Weinberg. Understanding Unix: A Conceptual Guide. 2nd ed. Singapore: Que Corp., 1988.

MLA (9th ed.) Citation

Groff, James R., and Paul N. Weinberg. Understanding Unix: A Conceptual Guide. 2nd ed. Que Corp., 1988.