O. M. Khalaf, A. T. Hani, and Z. K. Jasem, “Study the psychological unit and its relationship to the achievement of a 200 meter freestyle event for junior swimmers aged (13-14) years”, Psychosocial rehabilitation, vol. 24, no. 4, pp. 10755–10761, Apr. 2020, doi: 10.61841/5p1z5686.