Dr. Sabah Mohammed Yaseen. (2022). THE EFFECT OF SELF-CONFIDENCE EXERCISES TO RAISE THE PERFORMANCE LEVEL OF THE SMASH SERVE AND SMASH SPIKING SKILLS IN VOLLEYBALL FOR JUNIORS. ResearchJet Journal of Analysis and Inventions, 3(05), 27–39. https://doi.org/10.17605/OSF.IO/CB4FU