1. Principia Ethica;Moore,1903
2. How China blocked WHO and Chinese scientists early in Corona Virus outbreak: Despite publicly lauding China, WHO officials complained privately that the country wasn’t sharing vital information;Hatta,2020
3. First Covid-19 Case Happened in November 2019, China Government Records Show—Reporthttps://www.theguardian.com/world/2020/mar/13/first-covid-19-case-happened-in-november-china-government-records-show-report
4. How Did Coronavirus Start and Where Did It Come From? Was It Really Wuhan’s Animal Market?https://www.theguardian.com/world/2020/apr/28/how-did-the-coronavirus-start-where-did-it-come-from-how-did-it-spread-humans-was-it-really-bats-pangolins-wuhan-animal-market
5. Covid-19: Five Days That Shaped the Outbreakhttps://www.bbc.com/news/world-55756452