Nina Mardiana and Saptina Retnawati (2025) “The Impact of the Problem-Based Learning Model with Digital Student Worksheets on Student Learning Outcome at SMA PGRI Rumpin”, International Journal of Economics Education Research (IJEER), 6(2), pp. 1–10. Available at: https://openjournal.unpam.ac.id/index.php/IJEER/article/view/53883 (Accessed: 14 January 2026).