Abdalqader, M.A., Ariffin, I.A., Ghazi, H.F., AboBakr, M.F. and Fadzil, M.A. 2018. Prevalence of Insomnia and Its Association with Social Media Usage among University Students in Selangor, Malaysia, 2018. Folia Medica Indonesiana. 54, 4 (Dec. 2018), 289–293. DOI:https://doi.org/10.20473/fmi.v54i4.10715.