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Many resources are listed several times throughout this guide. Producers of grey literature often create multiple types of literature (e.g. reports, research findings, and meeting materials) so you may find several useful resources on one website.
Always use the advanced search option when searching for grey literature. Doing so can save you valuable time by narrowing your search appropriately.
The information contained on this topic in this research guide should not be considered exhaustive and the user should seek the advice of appropriate library professionals for additional resources and sites, if desired.
Core Resources + Subject Specific Resources + Grey Literature or Unpublished Studies = A Comprehensive Literature Review
The Fourth International Conference on Grey Literature (GL '99) in Washington, DC, in October 1999 defined grey literature as follows: "That which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers."
In general, grey literature publications are non-conventional, fugitive, and sometimes ephemeral publications. They may include, but are not limited to the following types of materials: reports (pre-prints, preliminary progress and advanced reports, technical reports, statistical reports, memoranda, state-of-the art reports, market research reports, etc.), theses, conference proceedings, technical specifications and standards, non-commercial translations, bibliographies, technical and commercial documentation, and official documents not published commercially (primarily government reports and documents) (Alberani, 1990).
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