UJI VALIDITAS E-MODUL BERBASIS PROBLEM BASED LEARNING MENGGUNAKAN HEYZINE PADA MATERI ASAM BASA FASE F SMA/MA. BIOCHEPHY:JSE [Internet]. 2025 Dec. 4 [cited 2026 Nov. 10];5(2):1053-9. Available from: https://www.staging-journal.moripublishing.com/index.php/biochephy/article/view/1805