Cita APA (7a ed.)

Scott, C., Erwin, M., & Wolfe, P. (1999). Virtual private networks (2nd ed.). O'Reilly.

Cita Chicago Style (17a ed.)

Scott, Charlie, Mike Erwin, y Paul Wolfe. Virtual Private Networks. 2nd ed. Sebastopol: O'Reilly, 1999.

Cita MLA (9a ed.)

Scott, Charlie, et al. Virtual Private Networks. 2nd ed. O'Reilly, 1999.