1. World Health Organization. Coronavirus disease (COVID-19): Situation report [Internet]. 2020 [cited 2022 Jun 11]. Available from: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports
2. Centers for Disease Control and Prevention. Coronavirus disease 2019 (COVID-19): How to protect yourself & others [Internet]. 2020 [cited 2022 Jun 11]. Available from: http://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html
3. Kurdistan Regional Government. Situation update: Coronavirus (COVID-19) [Internet]. 2020 [cited 2022 Jun 11]. Available from: http://gov.krd/coronaviru-en/situation-update/#situation-summary
4. Comparative analysis on the impact of distance learning between Russian and Japanese university students during the pandemic of COVID-19;V Viktoria;Educ. Q. Rev,2021
5. Closure of universities due to Coronavirus Disease 2019 (COVID-19): Impact on education and mental health of students and academic staff.;P. Sahu;Cureus.,2020