Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Ledford, Jerri L. Search Engine Optimization Bible. 2nd ed. Indianapolis, Indiana: Wiley Publishing Inc, 2009.

Cita MLA (9a ed.)

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