บุญเหลา ข. and พันธ์งาม อ. (2021) “Development of Basic Mathematical Skills of Kindergarten Year 2 Students at Ban Nongcheuak School under the Jurisdiction of Ubon Ratchathani Primary Educational Service Area Office 3 through Contemplative Learning Process”, Ubon Ratchathani Journal of Research and Evaluation, 5(1), pp. 1–9. available at: https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/250997 (accessed: 15 September 2026).