APA (7th ed.) Citation

Christian, K. (1994). Unix operating system (3rd ed.). John Wiley and Sons.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Christian, Kaare. Unix Operating System. 3rd ed. John Wiley and Sons, 1994.