Step 1: Check the peer review status of the JOURNAL.
Search for your title in Ulrichsweb Global Serials Directory.
When you find your journal, look for a "referee shirt" symbol. The symbol will appear next to any journal title that is peer reviewed and/or refereed (interchangeable terms).
Step 2: If the JOURNAL is peer reviewed, then assess the ARTICLE.
Is it a full research article? If your article is a short news brief, an editorial, a letter to the editor, or a re-print of a conference proceeding, it is not peer reviewed.
A technical defintion...
"That which is produced on all levels of govenment, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers."
(Fourth International conference on Grey Literature, Washington D.C., October 1999)
Examples of grey literature may include:
Market research reports
Newsletters and/or bulletins
Dissertations & Theses
Examples of why you might use grey literature: