Grossman, Gene; Helpman, Elhanan (2018). Identity Politics and Trade Policy (Report). Cambridge, MA: National Bureau of Economic Research. doi:10.3386/w25348.
Gutkind 1988. Gutkind, Peter C.W., ed. (1988). Third Worlds Workers: Comparative International Labour Studies. International Studies in Sociology and Social Anthropology. Vol.49. Leiden, Netherlands: E.J. Brill. ISBN978-90-04-08788-0. ISSN0074-8684.