M. Hussein and H. F. A. Alshamma, “The Effect Of Breathing Exercises On Relation and Self – Talk On Developing Ambition Level According to VTS – Sport and Achievement in Long Distance Runners”, jope, vol. 31, no. 3, pp. 29–38, Sep. 2019, doi: 10.37359/JOPE.V31(3)2019.856.