Always evaluate your resources. Think about:
The following links provide in-depth explanations and charts to evaluate sources.
There are two major steps when evaluating a resource. Look for the who, where, when, what, and why of the work.
1. Who, Where, When
2. What, Why
The Wikipedia Foundation has implemented an editing policy to provide greater oversight of certain articles. This change is expected to improve Wikipedia's accuracy and credibiliity. That said, the information in the resources listed below still holds.