Remzi Y. Kıncal, and Akan Deniz Yazgan. “Investigating the Formal Operational Thinking Skills of 7th and 8 Th Grade Primary School Students According to Some Variables”. Elementary Education Online, vol. 9, no. 2, Dec. 2023, pp. 723-3, https://ilkogretim-online.org./index.php/pub/article/view/718.