CHANTAHONG, M.; PREE-IAM, P. .; SUIKRADUANG, A. . The Development The Development of problem-based learning activities on price mechanisms in the economy Economics Secondary for Grade 9. Journal of Research and Development Institute Rajabhat Maha Sarakham University, [S. l.], v. 8, n. 2, p. 327–340, 2021. Disponível em: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/252170. Acesso em: 29 apr. 2024.