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4A. Ben-Ner & T. Van Hoomissen: Nonprofit Organization in the Mixed Economy, The Nonprofit Sector in the mixed economy, The University of Michigan Press, 1993.
5Lester M. Salamon, Helmut K. Anheier, Defining the Nonprofit Sector: A Cross-National Analysis. Manchester University Press, 1997.
6Henry Hansmann, "The Role of Nonprofit Enterprise", Yale Law Journal, Vol. 89(1980).
