APA (7th ed.) Citation

Christian, K., & Richter, S. (1994). The UNIX operating system (3rd ed.). Wiley.

Chicago Style (17th ed.) Citation

Christian, Kaare, and Susan Richter. The UNIX Operating System. 3rd ed. New York: Wiley, 1994.

MLA (9th ed.) Citation

Christian, Kaare, and Susan Richter. The UNIX Operating System. 3rd ed. Wiley, 1994.