Octaviani, Ines Damayanti, et al. “Effectiveness of WHO Stress Management for Improving Insomnia Severity Index Score in Telegram’s Self-Isolated Online Group Population”. Majalah Kedokteran Bandung, vol. 55, no. 2, June 2023, pp. 77–84, doi:10.15395/mkb.v55n2.2753.