Explains everything in detail. Technical issues that you can read about nowhere else are presented in depth. Paper.
In its fourth edition,
The QuarkXPress Book for Macintosh is a fixture of Quarkdom--it's the book that Quark's technical support staff has to learn cover-to-cover before hitting the phone lines. With new revisions for each version from 3.0 to 3.3 (and a complete rewrite for this edition), the book has matured along with the application.
The writing style is straightforward, presenting QuarkXPress as a set of major concepts, such as printing, type, and typography. Discussions in each chapter center around a particular task. For instance, the book approaches style sheets by first introducing the user to the concept and building a framework to demonstrate the use of style sheets before explaining the creation and other technical, menu, and dialog box-oriented issues.
Both beginners and somewhat experienced users can garner a lot from The QuarkXPress Book for Macintosh; it's rich enough to periodically return to once you've gained more experience with the program.