Cita APA (7a ed.)

Zend Technologies & Herbert, S. (2005). Zend PHP certification study guide. Sams Pub..

Cita Chicago Style (17a ed.)

Zend Technologies y Stuart Herbert. Zend PHP Certification Study Guide. Indianapolis, Ind: Sams Pub., 2005.

Cita MLA (8a ed.)

Zend Technologies y Stuart Herbert. Zend PHP Certification Study Guide. Sams Pub., 2005.