APA način citiranja (7. izdanje)
Butcher, M. (2008). Learning Drupal 6 module development: A practical tutorial for creating your first Drupal 6 modules with PHP. Packt.
Čikaški stil citiranja (17. izdanje)
Butcher, Matt. Learning Drupal 6 Module Development: A Practical Tutorial for Creating Your First Drupal 6 Modules with PHP. Birmingham: Packt, 2008.
MLA način citiranja (9. izdanje)
Butcher, Matt. Learning Drupal 6 Module Development: A Practical Tutorial for Creating Your First Drupal 6 Modules with PHP. Packt, 2008.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.