Wicked WordPress Themes
[SitePoint]

Sections on Thematic: This book offers a chapter on Theme Frameworks and raves about Thematic since it is well tested, has thousands of users, and a great community. The most helpful sections for Thematic theme developers include an explanation of filters, hooks, asides, style sheets, and widgets in other chapters.

You can download sample chapter and read a free tutorial by one of the authors — here.

Smashing WordPress
[Smashing Magazine]

Good for General Theme Building Reference: This well-written and helpful book gives you all you need to know about Theme development in general. Though it doesn’t specifically focus on Thematic solutions, you will find a good chapter on how to build and work with Child Themes.

Professional WordPress
[WROX Programmer to Programmer]

Programmers & Theme Designers’ Reference: This is a great book for programmers, and also the developer who wants to learn more about how WordPress works, and pick up some useful skills. Specific sections on Thematic include, and overview of Theme Frameworks, a discussion of the functions.php file in Thematic, and a few more mentions throughout the book.

Developers’ Library…

We’ve selected some more helpful reference books for WordPress developers — buy with confidence from Amazon… hover over book for more details.