Marwan Khairo Yaseen Hussein, and Saad Abbas Abid Al-Janabi. “Leading Patterns for Participated Administration Leaders of Clubs in Excellent Iraqi Periodical Volleyball”. Modern Sport, vol. 18, no. 3, Sept. 2019, pp. 289-00, https://jcopew.uobaghdad.edu.iq/index.php/sport/article/view/1488.