APA (7th ed.) Citation

Butcher, M. (2010). Drupal 7 module development: Create your own Drupal 7 modules from scratch. Packt.

Chicago Style (17th ed.) Citation

Butcher, Matt. Drupal 7 Module Development: Create Your Own Drupal 7 Modules from Scratch. Birmingham, UK: Packt, 2010.

MLA (9th ed.) Citation

Butcher, Matt. Drupal 7 Module Development: Create Your Own Drupal 7 Modules from Scratch. Packt, 2010.

Warning: These citations may not always be 100% accurate.