APA (7th ed.) Citation

Garfinkel, S., Spafford, G., & Schwartz, A. (2003). Practical UNIX and internet security (3a. ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Garfinkel, Simson, Gene Spafford, and Alan Schwartz. Practical UNIX and Internet Security. 3a. ed. Sebastopol: O'Reilly, 2003.

MLA (9th ed.) Citation

Garfinkel, Simson, et al. Practical UNIX and Internet Security. 3a. ed. O'Reilly, 2003.