APA (7th ed.) Citation

Christian, K. (1988). The UNIX operating system (2. ed.). Wiley.

Chicago Style (17th ed.) Citation

Christian, Kaare. The UNIX Operating System. 2. ed. New York u.a: Wiley, 1988.

MLA (9th ed.) Citation

Christian, Kaare. The UNIX Operating System. 2. ed. Wiley, 1988.