Taha Mohammed, F. H. “The Effect of Using Vygotsky’s Strategy on the Achievement of Fourth-Grade Science Students in Mathematics and Their Acquisition of Mathematical Concepts”. Journal of Tikrit University for Humanities, vol. 33, no. 8, 1, Aug. 2026, pp. 339-62, doi:10.25130/jtuh.33.8.1.2026.18.