Sawasworn, S., Tingsabha, S. and Vathagavorakul, R. (2022) “Effects of Core Muscle Training Program Using Progression Principle on Balancing and Receiving Skills in Beach Volleyball of Secondary School Students”, An Online Journal of Education, 17(2), p. OJED1702002 (16 pages). Available at: https://so01.tci-thaijo.org/index.php/OJED/article/view/257508 (Accessed: 29 March 2024).