Chaitorn, Siwat, and Somkiat Netprasert. 2019. “The effects of Two-Lower-Hand skill training in volleyball playing of Pathomsuksa Students in Tak Primary Education Service Area Office 1”. Rajapark Journal 13 (30). Bangkok, Thailand:142-50. https://so05.tci-thaijo.org/index.php/RJPJ/article/view/214849.