Cita APA (7a ed.)

Ledford, J. L. (2008). SEO: Search engine optimization bible (1st edition.). Wiley ; John Wiley [distributor].

Cita Chicago Style (17a ed.)

Ledford, Jerri L. SEO: Search Engine Optimization Bible. 1st edition. Hoboken, N.J. : Chichester: Wiley ; John Wiley [distributor], 2008.

Cita MLA (9a ed.)

Ledford, Jerri L. SEO: Search Engine Optimization Bible. 1st edition. Wiley ; John Wiley [distributor], 2008.