Isman, I. M. N., C. S. Cholis, S. I. Santi, and S. Subanji. “Student’s Thinking Process in Solving Proportions Based on Information Processing Theory”. Pegem Journal of Education and Instruction, vol. 14, no. 2, Jan. 2024, pp. 205-1, doi:10.47750/pegegog.14.02.25.