Jankanakittikul, Thanomsilp, and Asst. Prof. Dr. Kriengkrai Namnai. “The Application of Theory in International Investment”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 5, no. 1 (December 31, 2018): 249–258. Accessed May 5, 2024. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/210724.