http://www.IACDA.org  International Association of Collision Damage Analysts, Certification and Training for CDA

http://www.Tech-ITR.com  Technical Investigative Training Resources Inc., Collision and Insurance Investigative Training

http://www.LangeTech.net  Lange Technical Services LTD, an engineering and accident reconstruction firm

http://www.Collisionpedia.org  Collision Repair Industry Encyclopedia and Dictionary Free Website

http://grecopublishing.com/publications.html  Greco Publishing, Hammer and Dolly Magazine