Novita Sari, J. et al. 2025. Innovations in 21st Century Education: An Experimental Investigation of the Effect of Problem Based Learning on Students’ Learning Autonomy. Action Research Journal Indonesia (ARJI). 7, 3 (Jul. 2025), 1492 – 1506. DOI:https://doi.org/10.61227/arji.v7i3.416.