Grey Literature is research that has not been published commercially and is published outside of traditional academic sources (E.g. Books & Journals). Examples of grey literature are: statistics, government reports, conference proceedings, theses, clinical guidelines & clinical trials registers. Grey Literature can be an important source for finding the latest research findings and the most current statistics and data.
You can find many grey literature resources on government, industry, professional and community organisation websites.
Using the Google Advanced Search, refine your search using the following strategies:
Repositories contain unpublished documents and papers that have already been published in other forms. It can be a great place locate research findings before they are made available through a commercial publisher.