Cita APA (7a ed.)

Enge Eric, S. S. (2011). Art of SEO. Shroff Publisher.

Cita Chicago Style (17a ed.)

Enge Eric, Spencer Stephan. Art of SEO. Mumbai: Shroff Publisher, 2011.

Cita MLA (9a ed.)

Enge Eric, Spencer Stephan. Art of SEO. Shroff Publisher, 2011.