Suparini, S, R Rusdi, and Rizhal Hendi Ristanto. “Guided Discovery-Blended Learning (GDBL) for Critical Thinking Skill Empowerment: A Learning Strategy in Human Excretory System ”. Biosfer: Jurnal Pendidikan Biologi 13, no. 2 (October 22, 2020): 266–279. Accessed May 20, 2026. https://journal.unj.ac.id/unj/index.php/biosfer/article/view/15986.