Ahithophel: Time Bomb - A Seventh-Day Adventist discussion of the treasonous minister's inability to forgive King David's transgression with Bathsheba. - http://mcdonald.southern.edu/sermons/02/0413gb.htm
Ahithophel - A Baptist sermon on the treachery of King David's advisor. - http://www.independencebaptist.org/Articles_by_Pastor_Wayne_Reynolds/athithophel.htm
Jewish Encyclopedia: Ahithophel - Overview of the minister who betrayed King David from the traditional Jewish perspective, including Talmudic commentary. - http://www.jewishencyclopedia.com/view.jsp?artid=993&letter=A