For every assignment, and every research question, there is a different set of parameters for determing if information and sources are appropriate and useful.
Consider this statement: There is no such thing as an objectively good or bad source. There are only sources that are good or bad for YOUR research.
There are many different criteria that you need to consider in evaluating if information should be included in your research, or not. You can find a few guiding questions below.
Where on the continuum would the sources you found lie for this specific paper?
First point: How do you intend to use this source?
Your use will determine what answers you hope to get from the following questions.
Who is the author?
Why was the source written?
How was it written?
Why was it posted or published?