Ngerthaworn, Sutira Chairaksa, and Sudrudee Bamrung. 2021. “Making Jak sugar the traditional way in Pak Phanang district, Nakhon Si Thammarat province, Thailand: A Case Study”. Journal of International Studies, Prince of Songkla University 11 (1):134-55. https://so03.tci-thaijo.org/index.php/jis/article/view/243960.