faraj karim sharif, diman. “The Effect of an Educational Curriculum Using the Hanging Ball Device in Learning the Skills of the Smash Serve and the Smash Hit in Volleyball”. Al-Rafidain Journal For Sport Sciences (RJSS), vol. 24, no. 75, June 2025, pp. 150-64, doi:10.33899/rjss.2021.169807.