Ozkaya, H., M. Serdar, H. Acar, S. Pekgor, and S. Gunher Arica. “Evaluation of the frequency/Addiction of Smartphone Use and Its Effect on Sleep Quality in University Students”. Annals of Medical Research, vol. 27, no. 2, May 2021, pp. 0657-63, http://annalsmedres.org/index.php/aomr/article/view/603.