Khalaf, Othman Mahjoub. “Study the Psychological Unit and Its Relationship to the Achievement of a 200- Meter Freestyle Event for Junior Swimmers Aged (13-14) Years”. International Journal of Psychosocial Rehabilitation, vol. 24, no. 4, June 2020, pp. 10755-61, https://doi.org/10.61841/wgrddh03.