Cita APA (7a ed.)

Dover, D., & Dafforn, E. (2011). Search engine optimization secrets: Do what you never thought possible with SEO. Wiley.

Cita Chicago Style (17a ed.)

Dover, Danny, y Erik Dafforn. Search Engine Optimization Secrets: Do What You Never Thought Possible with SEO. Indianapolis, Ind.: Wiley, 2011.

Cita MLA (8a ed.)

Dover, Danny, y Erik Dafforn. Search Engine Optimization Secrets: Do What You Never Thought Possible with SEO. Wiley, 2011.