Sukma, Muhamad, Febi Kurniawan, and Fahrudin Fahrudin. 2019. “Survei Self Confidance Pada Peserta Ekstrakurikuler Futsal Di SMAN Se-Kecamatan Klari Kabupaten Karawang”. Jurnal Speed (Sport, Physical Education, Empowerment) 2 (2):31-38. https://doi.org/10.35706/speed.v2i2.3377.