Permatananda, Pande Ayu Naya Kasih, Sota Yamamoto, and Riko Kobayashi. “The Relationship Between Sleep Quality and Depression Level in Students During the Covid-19 Pandemic Period”. World Psychology 4, no. 1 (July 27, 2025): 127–136. Accessed November 2, 2025. https://ejournal.staialhikmahpariangan.ac.id/Journal/index.php/wp/article/view/799.