1. Anheier, H. K., & Seibel, W. (1990). The third sector: Comparative studies of nonprofit organizations. Berlin: DeGruyter.
2. Beckert, J. (1996). What is sociological about economic sociology? Uncertainty and the embeddedness of economic action. Theory and Society, 6(25), 803–840.
3. Carroll, G. R. (1985). Concentration and specialization: Dynamics of niche width in populations of organizations. American Journal of Sociology, 90, 1262–1283.
4. Carroll, G, R. & Hannan, M.T. (2000). The demography of corporations and industries. Princeton: Princeton University Press.
5. DiMaggio, P. (2003). Nonprofit organizations in the production and distribution of culture. In W. W. Powell & R. Steinberg (Eds.), The nonprofit sector: A research handbook (2nd edition, in press). New Haven: Yale University Press.