Cita APA (7a ed.)

Safari Tech Books Online & Trachtenberg, A. A. (2004). Upgrading to PHP 5. O'Reilly.

Cita Chicago Style (17a ed.)

Safari Tech Books Online y Adam Author Trachtenberg. Upgrading to PHP 5. [Place of publication not identified]: O'Reilly, 2004.

Cita MLA (9a ed.)

Safari Tech Books Online y Adam Author Trachtenberg. Upgrading to PHP 5. O'Reilly, 2004.