Zulfawati, Z., T. Mayasari, and J. Handhika. “The Effectiveness of the Problem-Based Learning Model Integrated STEM Approach in Improving the Critical Thinking Skills”. Jurnal Penelitian Fisika Dan Aplikasinya (JPFA), vol. 12, no. 1, June 2022, pp. 76-91, doi:10.26740/jpfa.v12n1.p76-91.