Full Idea
The basic sources of knowledge and justification are perception, introspection, testimony, memory, reason, and inference.
Gist of Idea
Perception, introspection, testimony, memory, reason, and inference can give us knowledge
Source
Bernecker / Dretske (Knowledge:Readings in Cont.Epist [2000], Pt.V Int)
Book Reference
'Knowledge: readings in contemp epistemology', ed/tr. Bernecker/Dretske [OUP 2000], p.431