1. Amano, Akihiro, Kurihara E., & Samuelson, L. (1980). Trade Linkage Sub-Model in the EPA World Economic Model, Economic Bulletin, No. 19, Economic Research Institute, Economic Plan Agency, Government of Japan.
2. Regional integration and global trading system,1993
3. Bagwell, Kyle & Staiger Robert (1993a). Multilateral Tariff Cooperation During the Formation of Regional Free Trade Areas’, NBER Working Paper No. 4364.
4. Multilateral tariff cooperation during the formation of customs unions;Bagwell,1993
5. Baldwin, Richard (1994). A Domino Theory of Regionalism, Centre for Economic Policy Research, Discussion Paper No. 857.