Shreves, R. (2012). Drupal search engine optimization: Drive people to your site with this supercharged guide to Drupal SEO. Packt Pub..
Citación estilo ChicagoShreves, Ric. Drupal Search Engine Optimization: Drive People to Your Site with This Supercharged Guide to Drupal SEO. Birmingham: Packt Pub., 2012.
Cita MLAShreves, Ric. Drupal Search Engine Optimization: Drive People to Your Site with This Supercharged Guide to Drupal SEO. Packt Pub., 2012.
Warning: These citations may not always be 100% accurate.