When evaluating print and/or electronic resources, always consider:
Authority - Who is the author? What is their point of view?
Purpose - Why was the source created? Who is the intended audience?
Publication & format - Where was it published? In what medium?
Relevance - How is it relevant to your research? What is its scope?
Date of publication - When was it written? Has it been updated?
Documentation - Did the author cite sources? Who did they cite?