You should review peer-reviewed journal articles, professional websites and books related to the variables in your chosen research question.
You should review a minimum of 6 scholarly sources. No more than two of your articles may be taken from an Internet resource (e.g. website). Peer-reviewed journal articles and books do not count as Internet resources, even if you retrieve them using the Internet. 
Your literature review should be 3-5 pages (at least 800 words; double spaced, not including the title page and references page).
It should also follow the American Psychological Association (APA) format.
Be sure to appropriately cite all other researchers’ materials in your review.
A references page should also be included with your literature review.