Azeez, A. Y., A. K. Wannas, and S. A. Ahmed. “The Effect of Mental Imagery Exercises Using Aiding Apparatuses on Improving Attention in Young Boxers”. Journal of Physical Education, vol. 33, no. 1, Mar. 2021, pp. 22-32, doi:10.37359/JOPE.V33(1)2021.1114.