Full Idea
The four basic kinds of belief are rooted in perception, memory, introspective consciousness, and reason.
Gist of Idea
Beliefs are based on perception, memory, introspection or reason
Source
Robert Audi (Epistemology: contemporary introduction [1998], Intr.p.7)
Book Reference
Audi,Robert: 'Epistemology: a contemporary introduction' [Routledge 1998], p.7