Sinulingga, A., Suprayitno, S. and Pertiwi, D. (2019) “Professionalism of physical education teachers: from the leadership of school principals, school culture to teacher work motivation”, Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, 5(2), pp. 296–311. doi: 10.29407/js_unpgri.v5i2.13113.