Susanti, S. et al. 2026. Analisis Dampak Kebiasaan Begadang Terhadap Kosentrasi Belajar Mahasiswa Kos di Universitas Negeri Medan. AR-RUMMAN: Journal of Education and Learning Evaluation. 3, 1 (Jun. 2026), 166–170. DOI:https://doi.org/10.57235/arrumman.v3i1.8559.