Unga, Poliny, Boonrat Ngowtrakula, Ratchakorn Chotpradita, and Nattapas Thavornwong. “Spatial Ability Test for Upper-Elementary School Student: Confirmatory Factor and Normative Data Analysis”. Journal of the Association of Researchers 21, no. 2 (June 23, 2020): 48–57. accessed October 5, 2026. https://so04.tci-thaijo.org/index.php/jar/article/view/243651.