The Effect of Teacher Academic Competence and Principal Supervision on the Professional Duties of Teachers Mediated by Work Commitment of Public Elementary School Teachers in Kapuas Timur Sub-Districts Journal title: International Journal of Social Science And Human Research Authors: Muhammad Ilham Ramadhan, Sulaiman, Muhammad Saleh Subject(s): Economics, Humanities, Law, Social Sciences, Literature, Sociology of Education, Criminology, Public Administration