Pongphoo, Thanakorn, Siriwan Rattanarasi, and Krisada Khruachalee. “Analysis of Principal Component and Clustering of Marketing Mix Factors on the Decision to Study at Sarasas Technological College”. Dusit Thani College Journal 17, no. 1 (April 30, 2023): 109–123. accessed March 20, 2025. https://so01.tci-thaijo.org/index.php/journaldtc/article/view/267060.