Grey literature is an important source of information for research in public policy that: 

• adds a valuable global perspective
• provides detailed overviews on specific populations
• may be only source of local information

Grey literature is defined as "information produced on all levels of government, academics, business and industry in electronic and print formats not controlled by commercial publishing" ie. where publishing is not the primary activity of the producing body." —ICGL Luxembourg definition, 1997. Expanded in New York, 2004

Library resources

• Grey Literature Guide
• Omni (the Library's main search box) (change Content Type to types of grey literature such as government documents, conference proceedings etc.)
• Dissertations and Theses Global
• Google Scholar (change country, for example, to find international material)
• Databases such as Canadian Business and Current Affairs and Web of Science
• Business Source Complete (select publication type "Grey literature")
• Think Tanks guide

Resources

• GreyNet International (organizations in Grey Literature and repository) 

Policy Reports and Working Papers

• Conference Board of Canada e-Library  Covers areas of Economic Trends, Organizational Performance, and Public Policy.
• NBER (National Bureau of Economics Research) Working Papers
• Policy File Index Indexes research on U.S. public policy with content from public policy think tanks, university research programs, research organizations, etc.

Think Tanks

• Think Tank Search (Harvard University custom search)
• detailed subject guide from the Business School at the University of Alberta

Government Information 

• Canadian federal government documents