1.
Usri WR, Fitria Y. Achievement of Student Learning Competencies Using Problem Based E-Book in Primary School . Tunas J Pendidikan Guru Sekolah Dasar [Internet]. 2023Dec.29 [cited 2025Jun.21];9(1):15-23. Available from: https://ojs.umpr.ac.id/tunas/article/view/6406