Sudey, A., AL-Rome, J., & AL-Sweede, A. (2007). The research aims at revealing the comparison between the effect of two ways of the direct and indirect mental training in developing some basic skills in volleyball . The researchers followed the empirical way in their wark. Al-Rafidain Journal For Sport Sciences, 13(45), 69–92. https://doi.org/10.33899/rajsport.2007.6196