Cita APA (7a ed.)

Safari Tech Books Online, Lerdorf, R. A., & Tatroe, K. C. (2002). Programming PHP. O'Reilly.

Cita Chicago Style (17a ed.)

Safari Tech Books Online, Rasmus Author Lerdorf, y Kevin Contributor Tatroe. Programming PHP. [Place of publication not identified]: O'Reilly, 2002.

Cita MLA (9a ed.)

Safari Tech Books Online, et al. Programming PHP. O'Reilly, 2002.