user22, user2, AND 		Allawi, M. Mahmoud.
" The effect of the Perkins and Blith model on the development of reasoning thinking among fourth graders in geography" <em>Journal of Tikrit university for humanities - مجلة جامعة تكريت للعلوم الانسانية</em> [Online], Volume 23 Number 1 (30 March 2019)