Sutrisno, I. ., and E. A. Sosiawan. “Covid-19 Disaster Management through Websites and Social Media Regency/City Government in the Special Region of Yogyakarta”. RSF Conference Series: Business, Management and Social Sciences, vol. 1, no. 4, Oct. 2021, pp. 190-01, doi:10.31098/bmss.v1i4.361.