Avakiat, S., and P. Roopsuwankun. “Business Innovation Factors Affecting the Performance of Small and Medium Enterprises in Service Business Sectors in Bangkok and the Central Region of Thailand”. APHEIT International Journal of Interdisciplinary Social Sciences and Technology, vol. 12, no. 1, June 2023, pp. 1-9, https://so04.tci-thaijo.org/index.php/ATI/article/view/261454.