1. Alves-Martins, M., Peixoto, F., Gouveia-Pereira, M., Amaral, V., & Pedro, I. (2002). Self-esteem and academic achievement among adolescents. Educational Psychology, 22(1), 51–62.
2. Andre, P. (2008). The effect of grade repetition on school dropout: An identification based on the differences between teachers. Retrieved August 12, 2009, from http://pagesperso-orange.fr/pierre.andre01/zdocuments/repetition_senegal_2008_01_23.pdf .
3. Asian Development Bank ADB. (2001). Health and education needs of ethnic minorities in the greater Mekong sub-region. Manila: Author.
4. Barton, C., & Rith, S. (2006). Corruption and poverty get school dropout blame. The Phnom Penh Post, A1–A8.
5. Bedi, S. A., & Marshal, H. J. (2002). Primary school attendance in honduras. Journal of Development Economics, 69, 129–153.