Atallah Al- Wakaa, A. H. “The Effectiveness of a Proposed Strategy According to the Twenty Keys of Thinking in the Literary Achievement of Fifth-Grade Students in History and the Development of Their Contemplative Thinking”. Journal of Tikrit University for Humanities, vol. 28, no. 3, 3, Mar. 2021, pp. 340-57, doi:10.25130/jtuh.28.3.3.2021.19.