PENGPRAK, K.; MAITHONG, W.; KRUEA-IN, C. Development of Problem-Based Learning Activity Packages on the Topic of Gas Exchange System for Grade 8 Students. Journal of Education & Learning Development Innovation, [S. l.], v. 5, n. 1, p. 97–109, 2026. Disponível em: https://so15.tci-thaijo.org/index.php/JELDI/article/view/3572. Acesso em: 17 sep. 2026.