What is grey literature?
"Grey Literature" are publications produced by government agencies, universities, corporations, research centers, associations and societies, and professional organizations. These publications can be very authoritative, but do not go through regular publishing like a scholarly article and are not peer-reviewed.
Examples of grey literature include:
Just as there are two stages of research for this class, so there are two "types" of materials needed.
Think tanks are institutions affiliated with universities, governments, advocacy groups, foundations, non-governmental organizations, and businesses that generate public policy research, analysis, and activity. Be aware that they usually have an agenda or bias.
Search Google for your topic and think tank to find think tank research.
Search Google for your topic and statistics.