“The Effect of Mental Imagery Training on the Performance of Volleyball Athletes in the Extracurricular Activities of MAN 3 Sukabumi”, Compet. J. Pendidik. Kepelatihan Olahraga, vol. 17, no. 2, pp. 2049–2054, Aug. 2025, doi: 10.26858/cjpko.v17i2.283.