The CRAAP test was originally developed to help researchers evaluate web sources, but the criteria work equally well for both print and electronic materials:
Currency
The timeliness of the information.
Relevance/Coverage
The depth and importance of the information.
Authority
The source of the information.
Accuracy
The reliability of the information.
Purpose/Objectivity
The possible bias present in the information.
For each item you have found, judge it using the above criteria. And ask yourself: Who wrote it? Does the author have any biases? What is the tone? Does the work cite other sources? How old is this material?
*The CRAAP test was developed at the Meriam Library at California State University Chico