“The Effect of Mental Imagery Training on the Performance of Volleyball Athletes in the Extracurricular Activities of MAN 3 Sukabumi”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 17, no. 2 (August 6, 2025): 2049–2054. Accessed August 24, 2025. https://competitor.idjournal.eu/index.php/competitor/article/view/283.