Grey literature (or gray literature) includes information or materials that are not published or indexed in the traditional databases, indexes, peer-reviewed journals, and books. These materials are referred to as grey or fugitive because they can be difficult to identify and obtain.
Examples include:
See the "Grey Literature" tab under Search (Task 5) - Systematic Review Guide - LibGuides at University of Texas Southwestern Medical Center for sources.
(Adorno, Garbee, & Marix, 2016; Booth, 2012; Grey Net International, 2019; Health Sciences Library McMaster University, 2019, Paez, 2017)
Select list of clinical trial registries follows. For other countries and/or regions, perform a keyword search on the internet.
Relevant professional associations may also be searched for additional information.
To search in ProQuest™ Dissertations & Theses Citation Index, select the database from the “Search In” dropdown on the Documents tab on the Web of Science home page.
Preprints are drafts of research manuscripts that are intended to be shared publicly. There are numerous preprint servers which can be searched using a combination of keywords. As preprint servers maybe subject/discipline focused, it may be necessary to search multiple preprint servers. Additionally, it is important to remember that preprints have not been peer reviewed. (Bonato 2022)
Statistical data can be found on:
