1. Alam, M. T. & Farid, S. (2011). Factors affecting teachers motivation. International Journal of Business and Social Science, 2(1), 298–304. Retrieved September 20, 2020 from http://www.ijbssnet.com/journals/Vol._2_No._1%3B_January_2011/30.pdf
2. The Factors Affecting Teacher-Motivation
3. Brunetti, A., Büchel, K., Jakob, M. S., Jann, B., Kühnhanss, C. & Steffen, D. (2020). Teacher content knowledge in developing countries: Evidence from a math assessment in El Salvador [University of Bern Social Sciences Working Paper 34]. University of Bern, Department of Social Sciences.