“UJI VALIDITAS E-MODUL BERBASIS PROBLEM BASED LEARNING MENGGUNAKAN HEYZINE PADA MATERI ASAM BASA FASE F SMA MA”. BIOCHEPHY: Journal of Science Education 5, no. 2 (December 4, 2025): 1053–1059. Accessed August 21, 2026. https://journal.moripublishing.com/index.php/biochephy/article/view/1805.