ANANDA, Della Widya; KARTINI; HUTAPEA, Nahor Murani. Implementation of Problem Based Learning Model at Class VII9 of SMP Negeri 21 Pekanbaru. Journal of Education and Learning Mathematics Research (JELMaR), [S. l.], v. 1, n. 2, p. 74–84, 2020. DOI: 10.37303/jelmar.v1i2.74. Disponível em: https://jelmar.wisnuwardhana.ac.id/index.php/jelmar/article/view/74. Acesso em: 25 aug. 2026.