1. Determinants of the commodity structure of U.S. trade;Baldwin;American Economic Review,1971
2. Studies in the basis of international trade;Ball,1967
3. Factor inputs in U.S. trade;Branson;Journal of International Economics,1977
4. The factor content of Israel's trade in a multilateral setting;Gideon,1980
5. ILO, various years, Yearbook of labor statistics (Geneva).