Can other "scripture" (such as the Quran) be used as ultimate authority in presuppositional apologetics?

I've been impressed lately with the presuppositional apologetic work of Sye Ten Bruggencate and how his arguments seem to be irrefutable by those he debates. The only problem I have is that he claims the Bible is the only ultimate authority that can be used in this argument. (See Bruggencate's site, question 4 ) Other religions have their own scripture which are held in the same regard as the Bible (for example the Quran in Islam, the Book of Mormon for Mormons, the Jehovah's Witness translation of the Bible). These other scriptures, though they may be dismissed by non-believers, seem to be of equal value in the presuppositional apologetic argument. Can anyone explain why the Bible is seen to be the only "scripture" that holds true in the presuppositional apologetic argument?