Ilwandri Ilwandri, Abdul Rahman, Tomi Apra Santosa, Zulkifli Zulkifli, Yayat Suharyat, and Suhaimi Suhaimi. 2023. “The Effect of Problem Based Learning-STEM on Students’ 21st Century Skills in Indonesia: A Meta-Analysis”. LITERACY : International Scientific Journals of Social, Education, Humanities 2 (1):151-62. https://doi.org/10.56910/literacy.v2i1.550.