O’NeillM. (2002). Nonprofit nation: A new look at the third America. Hoboken, NJ: John Wiley.
2.
SalamonLester M (1996). “Comparative Nonprofit Sector Working Paper #18.” The Johns Hopkins Comparative Nonprofit Sector Project. United States: Comparative Nonprofit Sector Publications: http://ccss.jhu.edu/publications-findings/?did=235