6Michael L. Cook, F. R. Chaddad, C. lliopoulos. Ad- vances in cooperative theory since 1990:A review of agricultural economics literature[A]', in Restructuring Agricultural Coopera- tives [ C ]. Hendrikse, 2004.
7Sexton R. J. The formation of cooperatives : A came - theoretic approach with implications for cooperative finance, de- cision making, and stability[ J ]. American Journal of Agricultural Economic, 1988,68 (2).
8Lewis Evans, Graeme Guthrie. A dynamic theory of co- operatives:The link between efficiency and valuation [ R]. New Zealand Institute for the Study of Competition and Regulation Inc ,2002.
