Determine the types of sources

Scholarly sources (also referred to as academic, peer-reviewed, or refereed) are written by experts in a particular field and serve to keep others interested in that field up to date on the most recent research, findings, and news. These resources will provide the most substantial information for your research and papers

Peer-reviewed sources have undergone the review and scrutiny of a review board of colleagues in the author's field. They evaluate this source as part of the body of research for a particular discipline and make recommendations regarding its publication in a journal, revisions prior to publication, or, in some cases, reject its publication.
Researchers often use scholarly and peer-reviewed sources because of the level of authority and credibility evident in scholarly sources they contribute a great deal to the overall quality of your papers. Use of scholarly sources is an expected attribute of academic course work.