1.https://en.wikipedia.org/wiki/Black_Death
2.https://en.wikipedia.org/wiki/Plague_doctor
3.https://en.wikipedia.org/wiki/Black_Death_in_England
4.https://en.wikipedia.org/wiki/List_of_epidemics
5.https://www.britannica.com/event/Black-Death
6.https://www.history.com/topics/middle-ages/black-death
7.https://www.nationalgeographic.com/science/health-and-human-body/human-diseases/the-plague/
8.https://www.newscientist.com/article/mg17223184-000-did-bubonic-plague-really-cause-the-black-death/