1.
Musyafirah S, Mulbar U. Needs Analysis and Design of Problem-Based Learning E-Book on Solid Geometry Material. JKPM [Internet]. 2026 May 26 [cited 2026 Jun. 6];5(2):257-66. Available from: https://ejurnal.univamedan.ac.id/index.php/jkpm/article/view/1276