Lubis, L., T. Kusumawiyanti, G. T. D. Nasution, and F. Dwirahmadi. “Sleep Quality Profile of Mining Workers Based on Pittsburgh Sleep Quality Index (PSQI) ”. Media Kesehatan Masyarakat Indonesia, vol. 18, no. 4, Dec. 2022, pp. 140-6, doi:10.30597/mkmi.v18i4.20154.