Pratiwi, Wahyu Nur, and Yuan Guruh Pratama. “Brain Gym Optimizing Concentration on Elementary Students”. STRADA : Jurnal Ilmiah Kesehatan 9, no. 2 (November 1, 2020): 1524–1532. Accessed September 28, 2025. https://sjik.org/index.php/sjik/article/view/498.