Jitngamplang, Boonkij, and Supranee Thampitug. “Thailand’s Potentials As World’s Gems and Jewelry Manufacturing Center and Trading Hub”. Ph.D. in Social Sciences Journal 9, no. 1 (April 27, 2019): 30–43. Accessed April 24, 2024. https://so05.tci-thaijo.org/index.php/phdssj/article/view/110400.