Saelee, Siriluck, Sasiton Kanchanasuvarna, and Vandee Sangpateptong. 2024. “The Development of Arithmetic Skills Assessment for 4th-6th Grade Elementary School Students”. STOU Education Journal 17 (1):119-29. https://so05.tci-thaijo.org/index.php/edjour_stou/article/view/268459.