I would imagine that most introductory psychology texts would touch on the gestalt principles. Two useful books that I have that cover them quite well are:

Visual Thinking for Design by Colin Ware

Information Dashboard Design by Stephen Few

The first focuses more on underlying principles of visual perception, the second is much more applied. Both have a more broad coverage than just the gestalt principles, but are handy books.

I would imagine that most introductory psychology texts would touch on the gestalt principles. Two useful books that I have that cover them quite well are:

Visual Thinking for Design by Colin Ware

Information Dashboard Design by Stephen Few

The first focuses more on underlying principles of visual perception, the second is much more applied. Both have a more broad coverage than just the gestalt principles, but are handy books. And of course there is always the Wikipedia entry on Gestalt principles.