P. R. Dewi, Desak Ketut Indrasari Utami, Ida Bagus Kusuma Putra, Anak Agung Ayu Meidiary, I Komang Arimbawa, and I Putu Eka Widyadharma, “The Correlation Between Serum Vitamin D Levels, Sleep Quality, and Fatigue Among Neurology and Psychiatry Resident Doctors”, WMJ, vol. 10, no. 1, pp. 28–33, May 2025.