Siagian, Fera Ratna Dewi, Soegiyanto Soegiyanto, and Donny Wira Yudha Kusuma. “Analysis of Performance, Commitment, and Self-Concept of Physical Education Teachers in Tanjung Pura-Langkat District”. Journal of Physical Education and Sports 8, no. 3 (May 26, 2019). Accessed December 28, 2024. https://journal.unnes.ac.id/sju/jpes/article/view/30657.