https://www.nationalgeographic.com/history/article/plague-doctors-beaked-masks-coronavirus?loggedin=true

https://en.wikipedia.org/wiki/Plague_doctor_costume#:~:text=The%20typical%20mask%20had%20glass,front%20of%20the%20doctor's%20nose.&text=The%20purpose%20of%20the%20mask,principal%20cause%20of%20the%20disease.

https://www.mentalfloss.com/article/505090/doctors-didnt-actually-wear-beaked-masks-during-black-plague

https://www.historyanswers.co.uk/medieval-renaissance/why-did-doctors-during-the-black-death-wear-beak-masks/