Azizah, R., Zaenuri, Z. and Kharisudin, I. (2022) “Problem-Solving Skill based on Self-Directed Learning Perspective with the Implementation of Problem-based Learning Assisted by Sie Sandra”, Unnes Journal of Mathematics Education Research, 11(2), pp. 129-137. Available at: https://journal.unnes.ac.id/sju/ujmer/article/view/61585 (Accessed: 21December2024).