1. Adorno, T. (2000). Problems of moral philosophy (T. Schroder, Ed. & R. Livingstone, Trans.). Stanford, CA: Stanford University Press.
2. Anheier, H. K., & Salamon, L. M. (2006). The nonprofit sector in comparative perspective. In A. Powell & R. Steinberg (Eds.), The nonprofit sector: A research handbook (2nd ed.). New Haven: Yale University Press.
3. Aspen Institute. (2002). Government: The nonprofit sector and government; clarifying the relationship. Washington, DC: Nonprofit Sector Strategy Group.
4. Blau, P. M., & Duncan, O. D. (1967). The American occupational structure. New York: Wiley.
5. Branigan, T. (2009). China officials shut legal aid centre. The Guardian. Retrieved July 18, 2009, from http://www.guardian.co.uk/world/2009/jul/18/china-shuts-legal-aid-centre