1. AAAS (American Association for the Advancement of Science). 1989. Science for all Americans: A Project 2061 Report on Literacy Goals in Science, Mathematics, and Technology. Washington, DC: American Association for the Advancement of Science.
2. Abebe, W., and T. Woldehanna. 2013. Teacher Training and Development in Ethiopia. Improving Education Quality by Developing Teacher Skills, Attitudes and Work Conditions. https://www.younglives.org.uk/content/teacher-training-and-development-ethiopia-improving-education-quality-developing-teacher
3. Teachers’ Mathematical Knowledge, Cognitive Activation in the Classroom, and Student Progress
4. Beatty, A., and L. Pritchett. 2012. From Schooling Goals to Learning Goals: How Fast Can Student Learning Improve? Center for Global Development Policy Paper 012. Accessed 29 January 2013. https://www.cgdev.org/sites/default/files/1426531_file_Beatty_Pritchett_Time_to_MLG_FINAL_0.pdf