1. Barro, R.J. and Lee, J.W. (1997) 'Data set for a panel of 138 countries'. Data set available on disk from the authors.
2. Cline, W.R. (1997) Trade and Income Distribution. Washington, DC: Institute for International Economics.
3. Deardorff, A.V. (1984) Testing trade theories and predicting trade flows'. In Jones, R.W. and Kenen, P.B. (eds) Handbook of International Economics, Volume 1, International Trade. North Holland: Elsevier Science, 467-517.
4. Hufbauer, G.C. (1970) 'The impact of national characteristics and technology on the commodity composition of trade in manufactured goods'. In Vernon, R. (ed) The Technology Factor in International Trade. New York: Columbia University Press, 145-231.
5. International Monetary Fund (1994) Direction of Trade (Computer File). Washington, DC: International Monetary Fund. Distributed by: Inter-university Consortium for Political and Social Research.