APA (7th ed.) Citation

Williams, B., Richard, O., Tadlock, J., & Valk, J. d. (2011). Professional WordPress plugin development. Wiley.

Chicago Style (17th ed.) Citation

Williams, Brad, Ozh Richard, Justin Tadlock, and Joost de Valk. Professional WordPress Plugin Development. Indianapolis, Ind.: Wiley, 2011.

MLA (9th ed.) Citation

Williams, Brad, et al. Professional WordPress Plugin Development. Wiley, 2011.