Centers for Disease Control and Prevention. Coronavirus Disease 2019 (COVID-19). Interim Guidance for Administrators of US Institutions of Higher Education
https://www.cdc.gov/coronavirus/2019-ncov/community/guidance-ihe-response.html
Άλλος ένας ιστότοπος Blogs.sch.gr
Centers for Disease Control and Prevention. Coronavirus Disease 2019 (COVID-19). Interim Guidance for Administrators of US Institutions of Higher Education
https://www.cdc.gov/coronavirus/2019-ncov/community/guidance-ihe-response.html