7Becket, G S. and Woytinsky, W. S.: Human Capital and the Personal Distribution of Income: An Analytical Approach, Institute of Public Administration, Ann Arbor, MI, 1967.
8Ben-Porath, Y.: The Production of Human Capital and the Life Cycle of Earnings, The Journal of Political Economy, 75(4): 352-365, 1967.
9Cai, L. X. and Kalb, G: Health Status and Labour Force Participation: Evidence from Australia, Health Economics, 15(3): 241-261, 2006.
10Cameron, A. C. and Trivedi, P. K.: Microeconometries Using Stata, Stata Press Books, 2010.