Hasan al-Janabi, M. M. “The Impact of the Strategy (cross-Plan-Folk) in the Collection of Mathematics and the Development of Conceptual Absorption Among the Fifth-Grade Female Biological Students”. Journal of Tikrit University for Humanities, vol. 26, no. 4, June 2019, pp. 450-75, doi:10.25130/jtuh.26.4.2019.21.