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Grey literature is research material that has not been formally published. By its nature, grey literature is hard to locate and the content is of variable quality.
It is recommended that grey literature sources are considered when undertaking a systematic review. Some sources of grey literature are listed on this page.
PsycExtra is a database of grey literature material relating to psychology, behavioural sciences and health. Full text is available for the majority of records - look out for the Ovid Databases PDFs link to access the full text.
Other grey literature sources
Clinical trial registries
ProQuest Dissertations & Theses A&I Provides 4.5 million master’s and PhD theses (abstract and citation) from universities around the world; access to the first 24 pages of each graduate work; 200,000 graduate works added every year; 270,000 A&I works added from 40 of China’s most prestigious universities, with English abstracts (2017); 3,100 universities and programs material included and abstract and index works dating back to 1637.