"Information resources reflect their creators’ expertise and credibility, and are evaluated based on the information need and the context in which the information will be used.
Authority is constructed in that various communities may recognize different types of authority. It is contextual in that the information need may help to determine the level of authority required" (ACRL, Authority is Constructed & Contextual).
Relevant learning concepts:
How does one determine the credibility of a source?
Title:Evaluating Authority Description: A two-minute video tutorial describing how to evaluate sources using the CRAAP test. Introductory level. Addresses print as well as online sources. Resource Type: Video Original Author(s): Western Libraries Added: 09/15/2017 By: firstname.lastname@example.org Frame(s):Evaluating authority