Remember the RADAR list when looking for good information:
Relevance (Is it pertinent to your search?)
Authority (What are the author's qualifications for this topic?)
Date (How important for your purpose that it be current?)
Accuracy (Is the information correct? Who says?)
Rationale (Why is the author writing? Any bias?)
4. Select the BEST representative candidates
This is more than just mechanical work. Use your best judgment as you review the materials you have selected for your preliminary list. Select books, articles, media and, if acceptable, authoritative Web sites that are informative, helpful, timely, relatively unbiased (or pick opposing views for balance), and which, taken together, provide good coverage of your topic.