6Russell W. Rumberg, 1983, "Dropping out of high school: The influence of race, sex, and family background", American Educational Research Journal, Vol.20.
7Russell W. Rumberg, 1987,"The impact of surplus schooling on productivity and earnings".Journal of Human Resources,Vol.22.
8Robert B. Carins,Beverley D Carins and Holly J Neekerman,1989, Early school dropout: Configurations and determinants, Child Development, Vol.60, No.6.
9Davico, 1990, "The Repeat and Drop-out Problem: A Study in Brazil on the Role of the Teacher". Prospects, vol.20.
10Carlos Peraita & Margarita Pastor,2000, "The Primary school dropout in Spain: the influence of family background and Lair market conditions." Education Economic, Vol. 8.