ชิโนกุล ช. “MARKETING MIX OF ENTERPRISES IN UPPER NORTHERN SPECIAL ECONOMIC ZONE: Chaiyuth Chinokul”. Journal of MCU Social Science Review, vol. 7, no. 2, July 2018, pp. 1-7, https://so03.tci-thaijo.org/index.php/jssr/article/view/132585.