Telaumbanua, F. ., H. R. . Silalahi, J. . Simanjuntak, S. R. . Siregar, M. I. . Simangunsong, S. . Panjaitan, and A. J. . Hutauruk. “Psychological Encouragement for High School Students in Preparation for Online Learning During Covid-19”. Middle European Scientific Bulletin, vol. 14, July 2021, doi:10.47494/mesb.v14i.672.