Jitwarin, Lapasrada, and Tawatchai Jitwarin. “The Development of Training Curriculum to Enhance Knowledge Operational Skills and English Communication Skills for Caddies”. Journal of Graduate MCU KhonKaen Campus 9, no. 1 (March 31, 2022): 102–114. Accessed May 5, 2024. https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/253047.