Mustafa, L. S., and R. B. Mahmood. “The Impact of the Circular House Strategy on the Achievement and Systemic Thinking of Middle School Students in Geography”. Journal of Tikrit University for Humanities, vol. 29, no. 8, 2, Aug. 2022, pp. 397-26, doi:10.25130/jtuh.29.8.2.2022.20.