THIS would be a great place for you to begin.
I read Tom Clancy's
Special Forces and it gives a good overall history of US Army Special Forces. At least it did for me.
Mr. Harsey is right,
Masters of Chaos was a great book, IMHO.
But you know what, if you go to the very beginning of this site, before you got to the forums, there are links on the left that are full of information, including history.
Also, do a search of the
Book Reviews and Recommendations forum here on professionalsoldiers.com. You will have so much reading and researching to do you will not find time to post.
Good luck, and tell your father Thank You for me.