all the previous posts are good suggestions and probably better than my following suggestion based on what you're probably looking for. BUT, I'd suggest "Anger" by Thich Nhat Hanh. Not your typical western philosophy as it is written by a Vietnamese Buddhist monk, but a good read nonetheless.
<a href="http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?userid=2TAVVHCX26&isbn=1573229377&itm=1">Anger</a>