จิตวิรัตน์ ด., and ยาวิราช ด. “A Confirmatory Factor Analysis of Factors Influencing the Competitiveness of Rubber Gross Industry Entrepreneurs under Conditions of Dynamic Change”. Journal of the Association of Researchers, vol. 21, no. 1, June 2020, pp. 154-65, https://so04.tci-thaijo.org/index.php/jar/article/view/243304.