Mann, S., Mitchell, E. L., & Krell, M. (2003). Linux system security: An administrator's guide to open source security tools (2nd ed.). Prentice Hall ; Pearson Education.

Mann, Scott, Ellen L. Mitchell, and Mitchell Krell. Linux System Security: An Administrator's Guide to Open Source Security Tools. 2nd ed. Upper Saddle, NJ : Delhi: Prentice Hall ; Pearson Education, 2003.

Mann, Scott, et al. Linux System Security: An Administrator's Guide to Open Source Security Tools. 2nd ed. Prentice Hall ; Pearson Education, 2003.