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Physical Therapy - Dallas

Physical therapy research guide for TWU Dallas students, faculty, and staff.

Gray Literature Sources

Gray Literature, put simply, is scholarly material that hasn't been published. For example, government documents such as white papers, student dissertations, or conference proceedings and minutes.

illustration word cloud of potential gray literature sources

Finding these studies can be difficult, but there are a few online resources that can be used to discover this type of unpublished research.

  • Google Scholar - This resource finds a lot of papers and studies that are kept at academic institutions.
  • ⁃ Open access to 700,000 bibliographical references of gray literature (paper) produced in Europe...This service will be closing in Summer 2021 and has uploaded its materials to Dans Easy Archive.

  • Dans Easy Archive EASY offers sustainable archiving of research data and access to thousands of datasets.

  • ⁃ For gray lit searching for resources prior to 2017 ⁃ 

  • The CADTH Grey Matters ⁃ CADTH stands for Canadian Agency for Drugs and Technologies in Health. A resource for searching gray literature.

  • The Grey Literature Report - This is a resource that is produced by the New York Academy of Medicine.
  • OpenGrey - This search engine looks through unpublished resources that can be found in Europe.
  • Opendoar - OpenDOAR is the quality-assured, global Directory of Open Access Repositories. 
  • Defense Tactical Information Center (DTIC)- military research.
  • TWU Repository - Research produced by TWU students, faculty, and staff.


cover image from book searching the grey literatureSearching the Grey Literature by Sarah Bonato.