Researchers must sift through a substantial amount of information from multiple sources, including books, peer-reviewed articles, primary sources, and online content. However, not all of the information available is suitable for use in assignments and research papers. To ensure that the sources you cite meet your professor's criteria, refer to your syllabus. It is also essential for researchers to evaluate the information they find for reliability, validity, authority, and relevance. Please refer to our Evaluating Information Sources guide to learn more.