For Historical Documents:
- Multiple attestation – if the fact about X is asserted by two or more
sources, then the fact is likely authentic.
- Dissimilarity – if a teaching of X is different from popular teachings
and concepts of that time and place, it is likely authentic.
- Embarrassment – if a fact is embarrassing to X or X’s community or the
writers of the biography of X, then it is likely authentic.
- Enemy attestation – if a fact about X is corroborated by enemies of X,
or X’s community, then that fact is likely to be authentic.
- Early attestation – if a fact about X is in an early source, then that fact
is likely to be authentic.
Note: These rules can not be used in negation. Example, No early attestation thus X not authentic(which is fallacious)