Pichai, S., D. Siriwallop, and T. Phimbaotham. “Clustering of ESTS Test Scores of Students in the Faculty of Science and Technology at Loei Rajabhat University”. KKU Science Journal, vol. 53, no. 3, Oct. 2025, pp. 401-2, doi:10.14456/kkuscij.2025.32.