Didik, D., A. Hidayat, and D. Dayatullah. “PENGARUH DISIPLIN KERJA DAN LINGKUNGAN KERJA FISIK TERHADAP KINERJA KARYAWAN PT CHEETHAM GARAM INDONESIA”. SULTAN ( Indonesian of Leadership and Management Journal), vol. 1, no. 1, Oct. 2020, pp. 33-49, https://jurnal.desantapublisher.com/index.php/sultan/article/view/46.