It's important to evaluate the quality of all the information you find. If you are using materials from the Web, this is even MORE important.
Think about the following:
While think-tank reports or briefings may be written by researchers with academic affiliations, they do not go through the same peer review process associated with journal articles. Below are some resources to help evaluate the content you are using from these sources.
Credit to the Think Tank Search guide from Harvard Kennedy School's Library and Knowledge Services for highlighting these sources.