Cita APA (7a ed.)

Ledford, J. L. (2009). Search engine optimization bible (2nd ed.). Wiley Pub..

Cita Chicago Style (17a ed.)

Ledford, Jerri L. Search Engine Optimization Bible. 2nd ed. Indianapolis, Ind.: Wiley Pub., 2009.

Cita MLA (8a ed.)

Ledford, Jerri L. Search Engine Optimization Bible. 2nd ed. Wiley Pub., 2009.