Books:
God, Freedom and Evil–Alvin Plantinga–here
The Problem of Pain–C. S. Lewis–here
Making Sense Out of Suffering–Peter Kreeft–here
Audio/Visual:
Pain & Suffering–William Lane Craig–Youtube–here
What is Evil & Where Did It Come From–R. C. Sproul–Youtube–here
Online articles:
God and the Problem of Evil–Dallas Willard–here
