APA (7th ed.) Citation

Erwin, M., Scott, C., & Wolfe, P. (1998). Virtual Private Networks, Second Edition (2nd edition.). O'Reilly Media, Inc..

Chicago Style (17th ed.) Citation

Erwin, Mike, Charlie Scott, and Paul Wolfe. Virtual Private Networks, Second Edition. 2nd edition. O'Reilly Media, Inc., 1998.

MLA (9th ed.) Citation

Erwin, Mike, et al. Virtual Private Networks, Second Edition. 2nd edition. O'Reilly Media, Inc., 1998.