5Caswell J A. Economics of Food Safety [M]. New York, NY: Elsevier Science Publishing Company, Inc, 1991.
6Caswell J A, Ronald C. Strategy and Policy in the Food System: Emerging Issues [M]. Storrs, CT: Food Marketing Policy Center,1997.
7Henson S. Regulating the trade effects of national food safety standards: Discussion of some issues [ A]. OECD Workshop on Emerging Trade Issues in Agriculture [M]. Paris: OECD Workshop, 1998. 25 -27.
