Muhtazah, F., D. Kahanjak, and S. Nugrahini. “The Relationship Between Sleep Quality and Concentration of Preclinic Students Faculty of Medicine Palangka Raya University 2022”. Barigas: Jurnal Riset Mahasiswa, vol. 1, no. 1, Mar. 2023, https://e-journal.upr.ac.id/index.php/medica/article/view/8034.