Hasanah, R., G. Gunawan, and M. Muntari. “Development of Problem-Based Physics Learning Tools: Evaluation of Validity and Practicality”. PUSTAKA DIDAKTIS: JURNAL MEDIA DAN MODEL PEMBELAJARAN, vol. 1, no. 1, Aug. 2025, pp. 6-19, https://erj.lombokinstitute.com/index.php/didaktis/article/view/9.