Sukma, M., Kurniawan, F. and Fahrudin, F. (2019) “Survei Self Confidance pada Peserta Ekstrakurikuler Futsal di SMAN Se-Kecamatan Klari Kabupaten Karawang”, Jurnal Speed (Sport, Physical Education, Empowerment), 2(2), pp. 31–38. doi: 10.35706/speed.v2i2.3377.