Kruetiwa, D., P. tansuwan, C. Kruetiwa, W. Keethong, C. Kraipetch, and K. Poopipat. “Implemetation Recreational Activities to Echance Early Childhood Development at the Responsibility Area of the Institute of Physical Education-Angthong”. Academic Journal of Thailand National Sports University, vol. 5, no. 3, Sept. 2013, pp. 17-30, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/254988.