Historical Introduction to Philosophy/Problem+of+Evil+Works+Sited
"Dictionary of Common Philosophical Terms" by Gregory Pence Copyright 2000 The McGraw-Hill Companies ISBN 0-07-282931-1
"The Longman Standard History of Philosophy" by Kolak and Thompson Copyright 2006 Pearson Education ISBN 0-321-23511-8
"The Elements of Moral Philosophy Fourth Edition" by James Rachels Copyright 2003 The McGraw-Hill Companies ISBN 0-07-119876-8
"Moral Soundings" Edited by Dwight Furrow Copyright 2004 Rowman & Littlefield Publishers ISBN 0-7425-3370-0
Webster's New World Dictionary, College Edition Copyright 1962
Columbia Encyclopedia, Sixth Edition. Copyright 2006 Columbia University Press
www.Dictionary.com Unabridged (v 1.0.1) Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Wikipedia http://www.wikipedia.org/