Hamad, Mahmoud.
" The Impact of an Educational Program Based on Van Hill's Model in the Development of Deductive Thinking among Students in the Fifth Literary    Grade in Geography and Their Attitude towards It" <em>Journal of Tikrit university for humanities - مجلة جامعة تكريت للعلوم الانسانية</em> [Online], Volume 26 Number 6 (15 October 2019)