I would recommend the book, Ask Them Why, by Jay Lucas. Jay Lucas writes from a presuppositionalist perspective. The first part of the book deals with methodology and the second part of the book features fictitious dialogs between a Christian and various non-Christians. The last part of the book contains the appendixes. The CDs that come with the book contain the fictitious dialogs that are in the book.
In one of the appendixes, Lucas talks about the formal debate he had with a philosophy student on the campus of a public university in Pennsylvania. Lucas had asked the philosophy department if he could debate one of the faculty members, but the philosophy department chose one of their best students to debate Lucas. Lucas gave a presuppositionalist defense of God's existence and the philosophy student was unprepared for the line of argumentation that Lucas gave. This philosophy student believed that the faculty had done him a disservice.