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 for Developing the Social and Community , Bangkok, Thailand, v. 8, n. 2, p. 327–340, 2021. Disponível em: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/252170. Acesso em: 16 sep. 2026.