Rueksanan, N. (2025) “Development of a Learning Management Model Using a Phenomenon-Based Concept to Enhance Systematic Thinking for Upper Elementary School Students”, Saengtham College Journal. Nakhon Phathom, Thailand, 17(2), pp. 63–81. available at: https://so01.tci-thaijo.org/index.php/scj/article/view/271253 (accessed: 3 September 2026).