7Jeffrey, S. Royer.. The Industrialization of Agriculture Vertical Coordination in US Food System, Ashgate Publishing Limited Gower House, 1998.
8Williamson, O E : Markets and Hierarchies : Analysis and Antitrust Implications, New York: Free Press, 1975.
9David, A. ,Hennessy, Y. :Contractual Relations, Control and Quality in the Hog Sector, Review of Agricultural Economics, Volume 21, No. 1, 1999, pp52- 67.
6SEXTON R J.The formation of cooperatives:a gametheoretic approach with implications for cooperative finance,decision making and stability[J].American Journal of Agricultural Economics,1986(2):68.