8KLEIN B,CRAWFORD R G,ALCHIAN A A.1978.Vertical integration,appropriable rents,and the competitive contracting process[J].Journal of Law and Economics,21 (2):297-326.
9Hagen Henry and Constanze Schimmel. Cooperatives for People-Centred Rural Development. ILO: Cooperative Branch:http ://www. ilo. org/em- pent/WorkingUnits/langen/WCMS_DOC ENT DPT_COO EN/index. htm. 30 June 2011.
10Nicholas luviene, Amy Stitely, Lorlene Hoyt. Sustainable Economic Democracy : Worker Cooperatives for the 21st Century. A publication series produced by the MIT Community Innovators Lab with support from the Barr Foundation, October 2010.