Check out U of T's guide to writing literature reviews:
Grey literature such as working papers, conference proceedings, technical reports,
and business documents are often harder to find.
Check the websites of government agencies, corporations, research centres, associations and societies for this type of material.
For more information, view the Western Libraries' video tutorial.
Peer review is the process of having an academic paper reviewed by experts to ensure that it meets the standards for the given discipline. Peer reviewed articles are also called scholarly or refereed articles. Video by University of Western Ontario Libraries.