Kelbytraining: Photoshop CS4 Beauty & Portrait Retouching Kit

Kelbytraining: Adobe Photoshop CS4 for Beginners

Black and White in Photoshop CS4 and Lightroom

The Adobe Photoshop CS4 Layers Book: Harnessing Photoshop’s most powerful tool

Understanding Adobe Photoshop CS4: The Essential Techniques for Imaging Professionals (2nd Edition)

Photoshop CS4 Down & Dirty Tricks

Adobe Photoshop CS4 Studio Techniques

Creative Photoshop CS4: Digital Illustration and Art Techniques

Photoshop CS4 Workflow: The Digital Photographer’s Guide

Photoshop CS4 After the Shoot