Reformed scholar Michael Kruger was asked about the "self-authenticating" nature of the Bible, an essential building block for Sola Scriptura and the formal sufficiency of the Bible:
Michael Kruger on What It Means That the Bible Is Self-Authenticating
For a solid refutation of the doctrine that Kruger is trying to ram into this, Sola Scriptura, as well as a discussion of the incredibly subjective epistemology Protestants are forced to engage in, see my book
Not by Scripture Alone: A Latter-day Saint Refutation of Sola Scriptura (an online version can be found here)
Michael Kruger on What It Means That the Bible Is Self-Authenticating
For a solid refutation of the doctrine that Kruger is trying to ram into this, Sola Scriptura, as well as a discussion of the incredibly subjective epistemology Protestants are forced to engage in, see my book
Not by Scripture Alone: A Latter-day Saint Refutation of Sola Scriptura (an online version can be found here)