Saeb Saleh, M. and Rashid Al-Azzawi, N.M. 2018. The impact of Karen’s model on the development of thinking Positive study among fifth grade literary students in the principles of philosophy and psychology for the academic year 2016-2017. Journal of Tikrit University for Humanities. 25, 3 (Mar. 2018), 480–511. DOI:https://doi.org/10.25130/jtuh.25.3.2018.s.