Aditya, A., S. Sagitarius, and O. N. Ajid. “INGGRIS THE EFFECT MIRROR DRILL AND BALL DROP DRILL ON THE REACTION SPEED OF KARATE KUMITE ATHLETES”. Sport Science, Vol. 26, no. 2, July 2026, pp. 67-78, http://sportscience.ppj.unp.ac.id/index.php/jss/article/view/325.