A book every university student should read

I'm going to spend eight weeks through the months of June and July taking a small group of college students through a book on discipleship. These are students we've identified in the ministry who have leadership potential. My goal is to call them into deeper level of followership. In preparation I've been thinking about which text would be best for the study. So I'll pose it to you and see what you think. Simply asked:

What do you think is one (or two) book(s) every university student should read?