Kurnaz, Ahmet. “Examining Effects of Mathematical Problem-Solving, Mathematical Reasoning and Spatial Abilities on Gifted Students’ Mathematics Achievement”. World Scientific Research 5, no. 1 (December 20, 2018): 37–43. Accessed April 19, 2024. http://www.asianonlinejournals.com/index.php/WSR/article/view/764.