Presuppositional Apologetics
The Presuppositional Apologetic - by James M. Harrison. A very clear, brief, and cogent explanation of the presuppositional method.
Presuppositional Apologetics - by Matt Slick. Matt gives a definition of the method, then provides an example of what it might look like in a conversation. Very helfpul.
Presuppositional Apologetics - by Xenos Christian Fellowship.
The Defense of Christianity - by Cornelius Van Til.
A Short Explanation and Defense of Presuppositional Apologetics - by Grover Gunn