Usri, Wenni Rahmadani, and Yanti Fitria. “Achievement of Student Learning Competencies Using Problem Based E-Book in Primary School”. Tunas: Jurnal Pendidikan Guru Sekolah Dasar 9, no. 1 (December 29, 2023): 15–23. Accessed November 23, 2024. https://journal.umpr.ac.id/index.php/tunas/article/view/6406.