APA (7th ed.) Citation

(1994). The UNIX operating system / Kaare Christian, Susan Richter.

Chicago Style (17th ed.) Citation

The UNIX Operating System / Kaare Christian, Susan Richter. 1994.

MLA (9th ed.) Citation

The UNIX Operating System / Kaare Christian, Susan Richter. 1994.

Warning: These citations may not always be 100% accurate.