US PGA Tour - Jack Nicklaus - Biography, photos, detailed playing statistics and tournament results for his PGA Tour and Champions Tour appearances. - http://www.pgatour.com/players/00/18/69/
Nicklaus.com - Official site with facts and figures, news and information on various business interests, including course design, merchandise, and golf instruction. - http://www.nicklaus.com/
Golf Stars Online - Jack Nicklaus - Reviewed links to websites, articles, interviews, merchandise and other online resources. - http://www.golfstarsonline.com/N/Jack_Nicklaus/