F. Fachrezzy, U. Maslikah, M. Ali, I. Hermawan, R. Reginald, and H. Nugroho, “Analysis Of The Relationship Between Concentration And Balance Against Yoep Chagi Kick Poomsae Movement Technique Sports Club Taekwondo Achievement State University Of Jakarta”, J. Ilm. Pendidik. Jasm, vol. 5, no. 3, pp. 536–544, Sep. 2021.