1. Barrett, A., Fitzgerald, J., & Nolan, B. (2002). Earnings inequality, returns to education and immigration into Ireland. Labour Economics, 9, 665–680.
2. Becker, G. (1964). Human Capital Theoretical Analysis with Special Reference to Education. New York: Columbia University Press for NBER.
3. Becker, G., & Chiswick, B. (1966). Education and the distribution of earnings. American Economic Review, 56, 358–369.
4. Booth, A., & Coles, M. (2007). A microfoundation for increasing returns in human capital accumulation and the under-participation trap. European Economic Review, 51, 1661–1681.
5. Britton, J., Shephard, N., & Vignoles, A. (2015). Comparing sample survey measures of English earnings of graduates with administrative data. Unpublished Paper, Department of Economics, Harvard University.