Chapter 13-1: What is a credible source?
A credible source is one that has a reduced probability of containing any of the following types of information:
incorrect information, or information created by a non-expert, or information from someone claiming to be an expert of questionable background
allows an author to publish directly to the public without any intermediary to check his or her work
unedited, unverified, or non-peer-reviewed claims or information
is not founded on established research and discourse
In other words, a credible source comes from a noteworthy publisher, one that verifies its authors work before publishing it.