Drupal 7 Explained: Your Step-by-step Guide
Drupal 7 Cookbook
The Definitive Guide to Drupal 7 (Definitive Guide Apress)
Programmer's Guide to Drupal: Principles, Practices, and Pitfalls
Drupal 7 Development by Example Beginner's Guide
Pro Drupal 7 Development (Expert's Voice in Open Source)
Drupal 7 Cookbook
Drupal 7 / Using Drupal