APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Christian, Kaare, and Susan Richter. The Unix Operating System. 3rd ed. New York: John Wiley & Sons, 1994.

MLA (9th ed.) Citation

Christian, Kaare, and Susan Richter. The Unix Operating System. 3rd ed. John Wiley & Sons, 1994.