Zebua, Justin Intan Purnama Sari, Hardikupatu Gulo, Toroziduhu Waruwu, Agnes Renostini Harefa, and Natalia Kristiani Lase. “PENGEMBANGAN BUKU SAKU IPA BERBASIS PROBLEM BASED LEARNING DI UPTD SMP NEGERI 8 GUNUNGSITOLI”. SECONDARY: Jurnal Inovasi Pendidikan Menengah 5, no. 4 (December 27, 2025): 732–741. Accessed May 3, 2026. https://www.jurnalp4i.com/index.php/secondary/article/view/8570.