MATLAB books

I am planning to use MATLAB (Mac version 5) and the
psychphysics toolbox. I have never used MATLAB, and I have
some experience with other languages (e.g., C). I am seeking
recommendations for a good MATLAB book for beginners. As a
psychologist, I'm concerned that most MATLAB books will be
written for engineers and others with strong mathematics
backgrounds. Thus I am hoping for some advice from psych
toolbox users about which books are clear about those features
that we are most likely to use.
Cheers,
Dan