Santika, D., F. . Kurniawan, and R. Gustiawati. “STUDI HASIL KONDISI MENTAL PESERTA EKTRAKURIKULER FUTSAL DI KECAMATAN TAMBUN SELATAN”. Jurnal Speed (Sport, Physical Education, Empowerment), vol. 4, no. 01, Aug. 2021, pp. 9-18, https://journal.unsika.ac.id/index.php/speed/article/view/5428.