Kuswoyo, Dilli, Harry Pramono, and Achmad Rifai RC. “Kontribusi Percaya Diri, Konsentrasi Dan Motivasi Terhadap Kinerja Wasit Persatuan Sepak Bola Seluruh Indonesia Provinsi Sumatera Selatan”. Journal of Physical Education and Sports 6, no. 3 (January 15, 2018): 241-247. Accessed December 27, 2024. https://journal.unnes.ac.id/sju/jpes/article/view/20587.