Here is a short video from the N.C. State librarians on evaluating sources for credibility:
Shared under the Creative Commons Attribution - Noncommercial - Share Alike 3.0 United States License.
The Important Questions of Evaluation:
| The 5 Ws | The Surface-Level Questions | The Deeper Questions | 
| 
 Who? | Who is the author, editor, or creator? Is the author qualified to write about this topic? Who is the publisher? | What makes them qualified? First-hand experience? An advanced degree? | 
| 
 What? | What type of document is it? For example, is it a newspaper article? A blog? A government website? A scholarly article? A book? What is it about? | There is no 'bad' type of document, but some have gone through a more rigorous review process than others. | 
| 
 When? | When was this source published? Is the publication date appropriate for your research? | The 'up-to-date'-ness of a source matters more for some research questions than others. | 
| 
 Where? | Where did the authors get their information from? Are citations provided? | What types of sources did the authors cite? | 
| 
 Why? | What was the goal of the author or publisher? Is there bias? | Bias does not necessarily negate credibility. We all have biases. The question then becomes: are those biases disclosed? Do they impact the quality of the information? | 
| 
 How? | How was the work reviewed before publication? | Was the work subject to peer review? |