The Fourth International Conference on Grey Literature (GL '99) in Washington, DC, in October 1999 defined grey literature as follows: "That which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers."
Be aware the word grey can also be spelt as "gray". You will need to look for either spelling when searching for "Grey Literature".
Examples of grey literature include:
Australian
International
Articles that discuss the value of grey literature for the fields of health policy and management
Resources
Further Reading