MUHIJAH, I.; SARI, R. M. M.; ZULKARNAEN, R.; EFFENDI, K. N. S. The Relationship between Self-Directed Learning and Problem-Solving Ability in Trigonometry. Journal of Mathematics Instruction, Social Research and Opinion, Bandung, Indonesia, v. 4, n. 4, p. 1351–1362, 2025. DOI: 10.58421/misro.v4i4.824. Disponível em: https://journal-gehu.com/index.php/misro/article/view/824. Acesso em: 16 aug. 2026.