แก้วจำนงค์ อ. “Leadership With Success of SMEs in Entering the ASEAN Economic Community: A Case Study of Songkhla”. Journal of Business Administration The Association of Private Higher Education Institutions of Thailand, vol. 7, no. 2, Nov. 2018, pp. 39-57, https://so02.tci-thaijo.org/index.php/apheitvu/article/view/153759.