Grey literature is the term used to describe material which has not been published by a commercial publisher, but which may still be of interest and use to researchers. It includes content like government reports, industry reports, White papers, theses, posters and presentations from conferences, patents, unpublished clinical trial data, business reports, market reports, working papers, preprints, and much more.
This type of material will generally not be found within the academic databases, so it is important to know where to look for it. We have listed some suggested sources below. As with anything that you locate freely available on the internet, do make sure that you evaluate the content for reliability and accuracy.