Sinaga CPS, Amdayani S. Implementation of STEM-PjBL Teaching Materials to Improve Student Learning Outcomes and Interest in Acid-Base Topics. HJKK [Internet]. 2026 Jun. 30 [cited 2026 Sep. 8];14(3). Available from: https://e-journal.undikma.ac.id/index.php/hydrogen/article/view/20649