4Larson D. , Varangis, Yabuki, N. Commodity risk management and Development[R ] . Washington, DC. , USA, World Bank. 1998.
5Myong, G. , Nayan. An introduction to market-- based instruments for agricultural price risk management [ R ] . Working document . Food and Agriculture Organization of the United Nations. 2006.
7Harwood, J., Heifner, R., Coblze, K., Perry. J. , Somwaru, Managing riskin farming: concepts, research, and analysis [R] . Agricultural Economic Report, no. 774. Economic Research Service, USDA. 1999.
8Keith ,H., Coble,Thomas, O.. Knight, George, F. , Patrick, Alan, E. , Baquet. Crop producer risk management survey: a preliminary summary of selected data [R]. Mississippi State University information report 1999.
9George, F. , Patrick, Alan, E. , Baquet, Keith, H. , Coble, Thomas, O. , Knight. Hog risk management survey: summary and preliminary analysis [R] .Purdue University staff paper # 00- 9. 2000.
10Robert, A., Hoppe, J., Johnson, Janet, E., Perry. Structural and financial characteristics of U.S. arms: 2001 family farm report [R]. Economic Research Service, USDA. 2001.
