https://en.wikipedia.org/wiki/Ignaz_Semmelweis#cite_note-FOOTNOTECarterCarter20059-21
https://www.britannica.com/biography/Ignaz-Semmelweis
https://globalhandwashing.org/about-handwashing/history-of-handwashing/
https://www.ncbi.nlm.nih.gov/books/NBK144018/
https://www.npr.org/sections/health-shots/2015/01/12/375663920/the-doctor-who-championed-hand-washing-and-saved-women-s-lives
http://semmelweis.org/about/dr-semmelweis-biography/
https://info.debgroup.com/blog/evolution-of-hand-hygiene
https://historynewsnetwork.org/article/149661
https://chroniclingamerica.loc.gov/lccn/sn87082456/1917-11-18/ed-1/seq-3/#date1=1789&index=1&rows=20&words=Ignaz+Semmelweis&searchType=basic&sequence=0&state=&date2=1963&proxtext=Ignaz+Semmelweis&y=0&x=0&dateFilterType=yearRange&page=1