Nookum, P. “Construction of Physical Fitness Norm’s for 7 - 9 Years Old Student of Vientiane Lao People’s Democratic Republic”. Academic Journal of Thailand National Sports University, vol. 7, no. 2, Mar. 2022, pp. 63-76, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/256455.