David, M. (2011). WordPress 3 search engine optimization: Optimize your Website for popularity with search engines. Packt Pub..
Chicago-referens (17:e uppl.)David, Michael. WordPress 3 Search Engine Optimization: Optimize Your Website for Popularity with Search Engines. Olton, Birmingham: Packt Pub., 2011.
MLA-referens (9:e uppl.)David, Michael. WordPress 3 Search Engine Optimization: Optimize Your Website for Popularity with Search Engines. Packt Pub., 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.