"Gray Literature" includes policy papers, working papers, and think tank publications. These sources are called gray literature because they are sometimes hard to locate and have no standard publication process. Because they are not standardized, they lack a vetting process like peer-review, but they are often considered authoritative due to the prestige of the groups publishing them.
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Groups whose primary activity is publishing:
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Entities and organization whose primary activity is not publishing:
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Because they are not controlled by commercial publishers, there is not a standard place to look or find gray literature.
Grey literature is sometimes cited in public policy research. Check the references of any sources you find to see what sort of grey literature is being cited.
The following links are tools that can be used to find relevant Non-Governmental Organizations (NGOs) or Inter-Governmental Organizations (IGOs):
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