Lutfiyanto, Alfian, Taufiq Hidayah, and Fakhruddin Fakhruddin. “Performance of Certified Physical Education Teacher (Review of Self Concept and Work Motivation)”. Journal of Physical Education and Sports 8, no. 2 (January 8, 2019): 133-139. Accessed May 6, 2024. https://journal.unnes.ac.id/sju/jpes/article/view/24587.