1. Akar, S. S., & Erden, M. K. (2021). Distance education experiences of secondary school math teachers during the pandemic: A narrative study. Turkish Online Journal of Distance Education, 22(3), 1–20. https://doi.org/10.17718/tojde.961809
2. Akinmola, E. A. (2014). Developing mathematical problem solving ability : a panacea for a sustainable development in the 21 st century by science and technical education department. International Journal of Education and Research, 2(2), 1–8.
3. Allchin, D. (2013). Problem- and case-based learning in science: An introduction to distinctions, values, and outcomes. CBE Life Sciences Education, 12(3), 364–372. https://doi.org/10.1187/cbe.12-11-0190
4. Amalia, E., Surya, E., & Syahputra, E. (2017). The effectiveness of using problem based learning (pbl) in mathematics problem solving ability for junior high school students. Ijariie, 3(2), 3402–3406.
5. Anwar, N. M., Rasool, S. S., Haq, R., (2012). A comparison of creative thinking abilities of high and low achievers secondary school students. International Interdisciplinary Journal of Education, 1(1), 1–6.