1. https://time.com/5791661/who-coronavirus-pandemic-declaration/ referenced on April 6, 2020.
2. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/events-as-they-happen referenced on April 6, 2020.
3. https://www.sciencealert.com/coronavirus-discovery-in-pangolins-shows-why-wildlife-markets-need-better-regulations referenced on April 6, 2020.
4. https://www.weforum.org/agenda/2020/04/we-could-be-vastly-overestimating-the-death-rate-for-covid-19-heres-why/ referenced on April 6, 2020.
5. Consensus document on the epidemiology of severe acute respiratory syndrome (SARS) https://www.who.int/csr/sars/en/WHOconsensus.pdf referenced on April 6, 2020.