Q: Is it Tom Hank's, Tom Hanks' or Tom Hanks
A: You have two choices, depending upon preference. The New York Times always does it this way: Hanks's. That is the style dicatated by The Chicago Manual of Style, the reference book that many newspapers and professional writers adhere to. However, The Associated Press Stylebook says to only add the apostrophe: Hanks' - and many other newspapers follow that book. Now you see why you get such differing views on this question! If you're going to write for a newspaper someday, you will follow their style preferences.