4Harry Bloch and Davad Sapsford: 1997, "Some Estimates of Prebisch and Singer Effects on the Term of Trade between Primary Products and Manufacturers" , World Development,Vol. 25, No. 1
5Zheng Zhihai and Zhao Yumin," China's Terms of Trade in Manufactures 1993 -2000", United Nations Conference on trade and Development, No. 161 ,June 2002
6G. Meier,Capterh. R,The International Economics of Development. ,New York: Harper Row 1968
5UNCTAD. Trade and Development Report[R]. New York: UNCTAD, 2002.
6Cypher, JamesM .and Dietz, James, L. Static and Dynam2ic Comparative Advantage: A . Multi - period Analysis with Declining Terms of Trade [ J ]. Journal of Economic Issues, 1998, Jun,-Vol. 32, Issue2.
