William Marshal--Book Recommendations?

[Darrell]

I read a bit online about William Marshal, the English knight. Can anyone recommend good books on the man? Three I've come across at Amazon:

William Marshal: Knighthood, War and Chivalry by David Crouch

http://www.amazon.com/William-Marshal-K ... y_b_text_y

William Marshal Earl of Pembroke by Catherine A Armstrong

http://www.amazon.com/William-Marshal-P ... gy_b_img_y

William Marshal: The Flower of Chivalry by Georges Duby

http://www.amazon.com/William-Marshal-T ... gy_b_img_z

Any others? From what little I read he was a remarkable man.