Grey literature is a valuable source of information, and includes any literature or document that has not been published via traditional or commercial publishers.
Don't forget to check the following for grey literature:
Always document your search methodology when searching grey literature. Details to keep track of include:
Well documenting your search methodology means that you will be able to explain how your results were retrieved. Doing this also allows you to accurately integrate your search approach into a larger piece of writing such as an essay, a poster, your thesis, etc.
Prepare a search plan before you begin to collect and screen documents. Use the template below (Word doc called "Grey Literature Search Plan") to organize and document your search results.
Often, Google can be the best tool to search for documents and reports published on the web. When recording your search methods, it is important to document the search terms used and the date the searches were performed.
Many universities have institutional repositories, which are online databases of publications by their members. Repositories can include publications by faculty and student dissertations and theses.