What Book Has Changed Your (Professional) Life?

(Editor's Note: Today we're featuring a request from fundraising consultant Nancy Schwartz.)

I’m hosting the May Nonprofit Blog Carnival, and on May 31 my blog post will feature links and summaries to the best of the event. Here’s the theme and how you can submit your post.

What's your one book?
A few weeks ago, long-time colleague Steve Damiano, director of professional development at New York City’s Support Center for Nonprofit Management, asked me to recommend a few marketing books for his nephew, soon to graduate with a marketing degree. Four titles quickly came to mind, a flow that made me realize that this is an ideal topic for the May Nonprofit Blog Carnival.