Ibrahim, Khalil, and Yessar Ali. “The Proposed Visual Exercises and Their Effect in the Dynamic Response and Regaining from the Net for the Libero in Volleyball in the Clubs of Al- Anabr Province”. Journal of Physical Education, vol. 26, no. 4, Dec. 2014, pp. 25-37, https://doi.org/10.37359/JOPE.V26(4)2014.515.