زمرد أ. ., يوسف س. . ., and عيسى م. . “Basic Thinking Skills Included in the Science curriculum’s Content for the First and Second Grades of Basic Education in the Syrian Arab Republic”. Tishreen University Journal- Arts and Humanities Sciences Series, vol. 43, no. 1, Feb. 2021, https://journal.tishreen.edu.sy/index.php/humlitr/article/view/10375.