Rueksanan, Napasiri. “Development of a Learning Management Model Using a Phenomenon-Based Concept to Enhance Systematic Thinking for Upper Elementary School Students”. Saengtham College Journal 17, no. 2 (December 30, 2025): 63–81. accessed September 3, 2026. https://so01.tci-thaijo.org/index.php/scj/article/view/271253.