Grey literature is literature that has not been formally published, but may include useful information for systematic reviews.
Resources where subject-specific grey literature is collected:
British Library reports, conferences and theses can be searched via the British Library catalogue.
HMIC (Health Management Information Consortium) contains records from both the Department of Health and The King's Fund. The King's Fund is an independent health charity that works to develop and improve management of health and social care services. Requires an NHS OpenAthens username and password. You can check your OpenAthens eligibility for one on the National Institute for Health and Care Excellence (NICE) website . If eligible, please contact Marishona Ortega at firstname.lastname@example.org.
LISTA (Library, Information Science & Technology Abstracts) contains key library and information science, books, research reports and more.
NICE Evidence Search provides access to selected and authoritative evidence in health, social care and public health.
Social Care Online UK’s largest database of information and research on all aspects of social care and social work.
Teacher Reference Center provides indexing and abstracts for more than 270 of the most popular teacher and administrator journals and magazines to assist professional educators.
CenterWatch Global source for clinical trials information: offering news, analysis, study grants and trial listings to professionals and patients.
DART-Europe e-theses provides a single European portal for the discovery of electronic theses and dissertations.
Google Scholar may be a useful place to start but if you search Web of Science you also include Conference Proceeding Indices for both Science, Social Science & Humanities.