1.
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. JDSC [internet]. 2021 Nov. 8 [cited 2026 Sep. 10];8(2):327-40. available from: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/252170