Cita APA (7a ed.)

Schwartz, A. (2004). Postfix: The definitive guide. O'Reilly.

Cita Chicago Style (17a ed.)

Schwartz, Alan. Postfix: The Definitive Guide. Sebastopol, California: O'Reilly, 2004.

Cita MLA (9a ed.)

Schwartz, Alan. Postfix: The Definitive Guide. O'Reilly, 2004.