Weerapol, Panyatuch, and Anak Charanyananda. 2020. “Thai Guitarist’s Self-Directed Learning: A Case Study of Thammarat Duangsiri”. Journal of Fine and Applied Arts Khon Kaen University 12 (1). Khon Kaen, Thailand:180-206. https://so02.tci-thaijo.org/index.php/fakku/article/view/197412.