APA (7th ed.) Citation

Petersen, R. (2012). Ubuntu 12.04 server: Administration and reference. Surfing Turtle Press.

Chicago Style (17th ed.) Citation

Petersen, Richard. Ubuntu 12.04 Server: Administration and Reference. Alameda, Calif: Surfing Turtle Press, 2012.

MLA (9th ed.) Citation

Petersen, Richard. Ubuntu 12.04 Server: Administration and Reference. Surfing Turtle Press, 2012.

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