Gultom, Rudolf L, FX Wikan Indrarto, Daniel C.A Nugroho, and Jonathan W Siagian. “Smartphone Addiction and Anxiety in High School Students – a Cross-Sectional Study”. BKM Public Health and Community Medicine 37, no. 2 (February 27, 2021): 47-50. Accessed July 23, 2024. https://journal.ugm.ac.id/v3/BKM/article/view/2067.