Gultom, R. L., Indrarto, F. W., C.A Nugroho, D. and Siagian, J. W. (2021) “Smartphone addiction and anxiety in high school students – a cross-sectional study”, BKM Public Health and Community Medicine, 37(2), pp. 47-50. doi: 10.22146/bkm.v37i2.2067.