A useful debate between to reformed theologians about apologetic methodology (classical vs. presuppositional) which can be purchased from Covenant Media Foundation (CMF), which has the copyright for Dr. Greg Bahnsen’s written works and audio lectures:


[A word of caution, this is currently the only place to purchase this debate, but the website, Covenant Media Foundation, does support the Federal Vision so be careful of the content on their website outside of the Apologetic Material from Greg Bahnsen].