1. World Health Organisation: World Health Organisation Emergiencies (2020). https://www.who.int/emergencies/diseases/novel-coronavirus-2019/events-as-they-happen. Accessed 18 May 2020
2. World Health Organisation: Worldometer, from COVID-19 CORONAVIRUS PANDEMIC (2020). https://www.worldometers.info/coronavirus/?. Accessed 13 June 2020
3. Ben Hu, X.G.-F.: Bat origin of human coronaviruses. Virology Journal, Hu et al. Virology Journal (2015). Accessed 18 May 2020
4. David, M., Patrick, M.D.: An outbreak of human coronavirus OC43 infection and serological cross-reactivity with SARS coronavirus. Research gate, 8 (2006). https://www.researchgate.net/publication/5469347. Accessed 18 May 2020
5. Siddhartha, R.: The New Normal: Analysis of COVID-19 Impact on the Indian Economy. Making Smalltalk, p. 1 (2020). Accessed 18 May 2020