http://www.amazon.com/dp/0849939879/?tag=baptis04-20 For some reason many authors have chosen to ignore this subject, and instead focused on the Emerging Church & the WOF movements. I do not know why as the New Spirituality seems to have a wider influence than the other movements. Just read any career book to see what I mean. Anyways this a great read. Some of it is a little dated but overall its very informative.