Sappaile, B. I., W. Marito, I. R. Satyaninrum, H. Kurniawati, Y. Wang, and G. Zou. “Use of Problem-Based Learning Strategies in Improving Problem Solving Skills”. Journal International Inspire Education Technology, vol. 2, no. 2, July 2023, pp. 90-100, doi:10.55849/jiiet.v2i2.456.