Christopher Robbins did a pretty good book on The Ravens, see here:
http://amzn.to/2dgOdZG
It's been a while since I read it but it is a pretty good mix of action and personal stories. He also wrote about Air America (
http://amzn.to/2dU7aGj) and I think that this book sparked the later movie with Mel Gibson and Robert Downey Jr. although that one went a bit overboard on some aspects of course. Both books are available second hand for pretty low prices, they might be worth a look.
Edit: There is also a website dedicated to the Ravens, see here:
http://www.ravens.org/ They also sell copies of Robbins' book.