Cita APA (7a ed.)

Szetela, D., & Kerschbaum, J. (2010). Pay-per-click search engine marketing: An hour a day. Wiley.

Cita Chicago Style (17a ed.)

Szetela, David, y Joseph Kerschbaum. Pay-per-click Search Engine Marketing: An Hour a Day. Indianapolis, Ind.: Wiley, 2010.

Cita MLA (8a ed.)

Szetela, David, y Joseph Kerschbaum. Pay-per-click Search Engine Marketing: An Hour a Day. Wiley, 2010.