Khalaf Ibrahim, Ziad, 		Jassim Hamash, Ismail, AND 		Mahmoud Khalaf, Yasser.
" The impact of the model of collective investigation in the collection of history material among the fifth grade students and the development of their reasoning thinking / Directorate General of Kirkuk Education" <em>Journal of Tikrit university for humanities - مجلة جامعة تكريت للعلوم الانسانية</em> [Online], Volume 24 Number 1 (30 March 2019)