The Art Direction Handbook by Michael Rizzo

This book outlines a range of aspects and responsibilities that comes with being an art director mentioning, but not limited to; the pre production process, the other departments you need to be involved with i.e.; The greensman, prop master, visual effects etc. as well as talking about going through the design process.

It gives you a good understanding of what your role as an Art Director is and showed me that in some ways they are responsible for the final picture the audience views.