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Grey Literature: Sources of grey literature

Working with Grey Literature

Critical appraisal 

Before you select any grey literature to use in research be aware that, like other published literature, its quality can vary, therefore critical appraisal skills need to be employed in assessing its quality. To do this, use the  AACODS Checklist for appraising grey literature.


UK sources of grey literature

Clinical Trials

International sources of grey literature

Pre-print servers

A preprint is a version of an paper before it has been submitted for formal peer review and publication in a peer-reviewed academic journal.

greylitsearcher: systematically search for grey literature

This tool, created by Neal Haddaway, enables you to search any website using Google with a basic search: each result is tabulated in a CSV (source, title, URL, description)