https://www.worldometers.info/coronavirus/#page-top
https://ourworldindata.org
În timpul gripei spaniole:
https://www.gsp.ro/stiri-externe/stiri-extrasport/cum-arata-lumea-in-timpul-gripei-spaniole-asemanari-cu-pandemia-de-coroanvirus-595048.html
https://www.cotidianul.ro/foto-document-de-la-pandemia-de-gripa-spaniola/
