Some people may take offense at this, but since college and likely debt is involved, Dave Ramsey's "Total Money Makeover" is a good start. I had a copy at the end of high school but still took out large student loans. The lessons were not lost on me, though, and I progressively made better decisions through college (private college -> community college -> cheapest quality state university -> paying some loans off while in school -> graduation -> living with parents to pay loans off -> debt free).
TMM also places a little more emphasis on the emergency fund. Your ability to invest during college is significantly impaired so I don't think it's the best thing to focus on, but if you have an old beater that is getting you to work so you can pay your way through school, you really want that emergency fund. People further into FI often scoff at large amounts in the bank but they usually have a sizeable stash and aren't affected too greatly by market downturns. These people often know more about taxes and have the time to study them. Just sayin'. Full FI will probably turn him off to the subject since the big barrier in front of him is college and everything that comes with that, but I guess you never know.
Millionaire Next Door is difficult to forget, it's short and sweet. Jacab's book "Early Retirement Extreme" would be especially relevant to someone in college, and is one of my all-time favorite books.
