100 Biblical Arguments Against Sola Scriptura by Dave Armstrong is a Catholic apologetics book that challenges the Protestant belief in “Scripture alone” (sola scriptura). Recognizing that many Catholics struggle to respond when asked, “Where is that in the Bible?” Armstrong provides a thorough, Bible-based rebuttal to this doctrine. Designed specifically for engaging Fundamentalists and other Protestants who reject non-biblical sources, the book offers clear, scripturally grounded arguments to demonstrate why sola scriptura is flawed and why Catholic teaching relies on both Scripture and tradition.