Cita APA (7a ed.)

Christian, K. (1983). The UNIX operating system. John Wiley & Sons.

Cita Chicago Style (17a ed.)

Christian, Kaare. The UNIX Operating System. New York [etc.]: John Wiley & Sons, 1983.

Cita MLA (9a ed.)

Christian, Kaare. The UNIX Operating System. John Wiley & Sons, 1983.