The Definitive Guide to Drupal 7 - Melançon, Benjamin; Luisi, Jacine; Négyesi, Károly; Anderson, Greg; Somers, Bojhan; Corlosquet, Stéphane; Freudenberg, Stefan; Lauer, Michelle; Carlevale, Ed; Lorétan, Florian; Nordin, Dani; Szrama, Ryan; et al. (Apress, 2011)