Niradrop, Onchulee. 2023. “THE DEVELOPMENT OF AN E - LESSON TO PROMOTE LEARNING IN PRINCIPLES AND METHODS OF TEACHING AND TENNIS REFEREE FOR UNDERGRADUATE STUDENTS”. Academic Journal of Thailand National Sports University 15 (3). Chonburi, Thailand:269-82. https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/261662.