D. . Rahayu, M. A. Adriansyah, D. D. N. . Rahmah, P. Y. T. . Sanhadi, M. Q. Hasan, and M. N. . Kalbu, “Brain Gym Therapy: Focus Attention as an Effort to Improve Student Learning Concentration”, IJSSB, vol. 6, no. 3, pp. 404–409, Jul. 2022.