1. Carter, T. J. (1999). Illegal immigration in an efficiency wage model. Journal of International Economics, 49, 385–401.
2. Djajić, S. (1985). Human capital, minimum wage and unemployment: A Harris-Todaro model of a developed open economy. Economica, 52, 491–508.
3. Ethier, W. J. (1985). International trade and labor migration. American Economic Review, 75, 691–707.
4. Harris, J. R., & Todaro, M. (1970). Migration, unemployment and development: A two sector analysis. American Economic Review, 60, 126–142.
5. Kondoh, K. (2004). International immigration, economic welfare in an efficiency wage model: The co-existence case of both legal and illegal foreign workers. Pacific Economic Review, 9, 1–12.