Khalaf Ibrahim, Z., Jassim Hamash, I., & Mahmoud Khalaf, Y. (2019). 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. Journal Of Tikrit University For Humanities - مجلة جامعة تكريت للعلوم الانسانية, 24(1), 71-164. doi:10.25130/hum.v24i1.334