1.
Phothisa B, Worakham P. The Development of Problem-Based Learning Activities to Promote Science Process Skills of Grade 1 Students. edurmu [internet]. 2024 Aug. 29 [cited 2025 Dec. 9];21(2):39-48. available from: https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/264484