Demonstrating finding grey literature and secondary sources Added on Sep 19, 2019 Duration: 0:03:20 Grey literature refers to documents that are either unpublished or have been published in non-commercial form. The term includes: government reports, statistics, policy statements and guidance; conference proceedings and theses and dissertations. You may not have time to do a search on bibliographic databases for evidence but even if you do have this time you should always start your enquiries with a search of any of the relevant policy documents that are available to you in your local context. In the UK these might include searching the websites of NICE / The King’s Fund / UK.gov / NHS etc. for documents relevant to your enquiry. It can be important that you find and use the most recent update of any grey literature that you are interested in e.g. in the case of national health guidance.