BlackwoodAmy, WingKennard T., and PollakThomas H.. 2008. The Nonprofit Sector in Brief: Facts and Figures from the Nonprofit Almanac 2008: Public Charities, Giving, and Volunteering. Washington, D.C.: The Urban Institute.
YoungDennis R.1999. Complementary, Supplementary, or Adversarial? A Theoretical and Historical Examination of Nonprofit-Government Relations in the United States. In Boris, Elizabeth T. and C. Eugene Steuerle, eds. Nonprofits and Government. Washington, D.C.: The Urban Institute Press.