APA (7th ed.) Citation

Lerdorf, R., Tatroe, K., Kaehms, B., & McGredy, R. (2002). Programming PHP. O'Reilly.

Chicago Style (17th ed.) Citation

Lerdorf, Rasmus, Kevin Tatroe, Bob Kaehms, and Ric McGredy. Programming PHP. Sebastopol, California: O'Reilly, 2002.

MLA (9th ed.) Citation

Lerdorf, Rasmus, et al. Programming PHP. O'Reilly, 2002.