Irawan, Arfa Destira, and Heppy Okmarisa. “The Effect of the Project-Based Learning (PjBL) Model on Students’ Learning Motivation in the Topic of the Periodic Table of Elements”. Hydrogen: Jurnal Kependidikan Kimia 14, no. 3 (June 30, 2026). Accessed September 8, 2026. https://e-journal.undikma.ac.id/index.php/hydrogen/article/view/20847.