Drupal 6 Panels Cookbook
Drupal 6 Social Networking
PHP Programming with PEAR: XML, Data, Dates, Web Services, and Web APIs
Beginning Drupal (Wrox Programmer to Programmer)
Leveraging Drupal: Getting Your Site Done Right (Wrox Programmer to Programmer)
Learning Drupal 6 Module Development
Drupal 6 Search Engine Optimization
Sams Teach Yourself Drupal in 24 Hours
Flash with Drupal
