Khobjaikong, C., and P. Temchavala. “The Study of Competitiveness Performance, Most Problematic Factors for Doing Business and Opportunities of Thai New Engine of Growth Industry to ASEAN Market”. Rajapark Journal, vol. 12, no. 26, Sept. 2018, pp. 12-31, https://so05.tci-thaijo.org/index.php/RJPJ/article/view/145086.