Nilapornkul, Napaporn, Thanwarat Suwanna, and Kannika Sribunruang. 2018. “Financial Hedging of Firms in the Industrial Estate of Thailand”. Ph.D. In Social Sciences Journal 8 (S):27-43. https://so05.tci-thaijo.org/index.php/phdssj/article/view/135838.