APA (7th ed.) Citation

Linux Professional Institute, Pritchard, S., & Pritchard, S. (2006). LPI Linux certification in a nutshell (2nd ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Linux Professional Institute, Steven Pritchard, and Steven Pritchard. LPI Linux Certification in a Nutshell. 2nd ed. Beijing ; Sebastopol, California: O'Reilly, 2006.

MLA (9th ed.) Citation

Linux Professional Institute, et al. LPI Linux Certification in a Nutshell. 2nd ed. O'Reilly, 2006.