First, always check the assignment criteria.
Sources for a literature review include:
- peer-reviewed research articles ( also known as empirical studies)
- peer-reviewed theoretical articles
- peer-reviewed literature reviews on the topic
- scholarly books and book chapters (depending upon the assignment criteria/ professor's guidelines)
What counts as a scholarly/ peer-reviewed article?
Generally, when an assignment requires that a specific number of peer-reviewed articles be included, the following do not count toward the required number because they are NOT peer-reviewed
- book reviews that appear in scholarly journals
- editorials that appear in scholarly journals
What is Grey Literature? (check assignment criteria to see if you can include grey literature)
- Is an important supplement to peer-reviewed literature in many fields and professions
- Includes research reports, policy statements, manuals, issues papers, conference proceedings, and more.
- Is produced on all levels (local, national, international) of government, academics, business, and industry.
- Is NOT controlled by commercial publishers. Therefore, it is not typically found in scholarly databases and is usually freely available to the public.