Tanjung, Y. I. T., Festiyed, F., Diliarosta, S. D., Jubaidah, J. and Sanjaya, A. P. S. (2024) “Analysis of Students’ Problem Solving Skills based on Heller Indicator”, Pegem Journal of Education and Instruction, 14(4), pp. 421–433. doi: 10.47750/pegegog.14.04.40.