Shreves, R. (2012). Drupal search engine optimization: Drive people to your site with this supercharged guide to Drupal SEO. Packt Pub.
Chicago-Zitierstil (17. Ausg.)Shreves, Ric. Drupal Search Engine Optimization: Drive People to Your Site with This Supercharged Guide to Drupal SEO. Birmingham: Packt Pub, 2012.
MLA-Zitierstil (9. Ausg.)Shreves, Ric. Drupal Search Engine Optimization: Drive People to Your Site with This Supercharged Guide to Drupal SEO. Packt Pub, 2012.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.