APA (7th ed.) Citation

Smith, R. W. (2005). Linux+ study guide (3rd ed.). SYBEX.

Chicago Style (17th ed.) Citation

Smith, Roderick W. Linux+ Study Guide. 3rd ed. San Francisco, Calif: SYBEX, 2005.

MLA (9th ed.) Citation

Smith, Roderick W. Linux+ Study Guide. 3rd ed. SYBEX, 2005.