Grey literature is any information that is not produced by commercial publishers. This resource guide describes the different types of grey literature, suggests a number of search tools and resources you can use to find this sort of information and gives some tips on how to search effectively for this hard-to-find material.

“Grey literature stands for manifold document types produced on all levels of government, academics, business and industry in print and electronic formats that are protected by intellectual property rights, of sufficient quality to be collected and preserved by library holdings or institutional repositories, but not controlled by commercial publishers i.e., where publishing is not the primary activity of the producing body”