The following questions give you some good guidelines for recognizing what type of source (scholarly, popular, political, etc.) you are reading and for evaluating its relevance and usefulness to your topic and your research process in general. Prior to evaluating the source, however, it is important to remain attentive to the thoughtful and creative ideas and questions that you bring to your research process and that may be fueled in a first reading of this source. That is, scrutinizing the text for answers to the following list of questions will not necessarily give you all the "answers" you are looking for in your research; approach the text in the spirit of curiosity and creativity, guided as much by the following questions as by your own sets of questions and interests.
In general, popular sources do not require extensive prior knowledge of a topic. Scholarly sources assume a greater level of sophistication and knowledge on the part of the reader. See Distinguishing Scholarly Journals from other Periodicals for more information.
Tips for reading scholarly sources
Distinguishing Scholarly Journals from other Periodicals
Evaluating Information found on the Internet (from Johns Hopkins University)