6Bochlje, M.: Industrialization of the U.S. Swiwine Industry, paper submitted to the Allen D. L~man Swine Conference, University of Minnesota, 1966.
7Boger S.: Quality and Contractual Choice: A Transaction Cost Approach to the Polish Hog Mark~q European Review of dgriculturdEconomics, 28(3): 241-261, 2001.
8Bruyn, N. Vrmk, N. and Kirsten, J. E: How Transaction Costs Influence Cattle Marketing Decisions in the Northern Communal Areas of Namibia,23(2): 131-142, 2001.
9Feder G; Just, R. E. and Zilberman D.: Adoption of Agricultural Innovations in Developing Counlries: A Survey, Economic Development and Cultural Change, 3(3): 255-297, 1985.
10Kliebenstein, James B. and Lawrence, John D.: Contracting and Vertical Coordination in the United States Pork Industry, American Journal o f Agricultural Economics, 77(5): 1213-1218, 1995.
