MUSYAFIRAH, Syaila; MULBAR, Usman. Needs Analysis and Design of Problem-Based Learning E-Book on Solid Geometry Material. OMEGA: Jurnal Keilmuan Pendidikan Matematika, [S. l.], v. 5, n. 2, p. 257–266, 2026. DOI: 10.47662/jkpm.v5i2.1276. Disponível em: https://ejurnal.univamedan.ac.id/index.php/jkpm/article/view/1276. Acesso em: 6 jun. 2026.