Ham, A. Q. M., J. K. Muhammed, N. S. Ahmed, and N. H. Adil. “Teaching Performance of Physical Education Teachers in Primary Schools from the Perspective of the Theory of Interest”. Journal of Duhok University, Vol. 21, no. 2, Aug. 2019, pp. 298-12, https://journal.uod.ac/index.php/uodjournal/article/view/305.