J. SIMAMORA, S.; E. SIMAMORA, R.; SINAGA, B. Application of Problem Based Learning to Increase Students’ Problem Solving Ability on Geometry in Class X SMA Negeri 1 Pagaran. International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 36, n. 2, p. 234–251, 2017. Disponível em: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8100. Acesso em: 3 may. 2024.