https://www.history.com/topics/world-war-ii/d-day
https://www.nationalww2museum.org/students-teachers/student-resources/research-starters/research-starters-d-day
https://www.historyonthenet.com/d-day/
https://www.cnn.com/2013/06/03/world/europe/d-day-fast-facts/index.html
https://www.archives.gov/research/military/ww2/d-day [Advanced]
Source: Extra Credits, "D-Day - I: The Great Crusade - Extra History." Published June 6, 2017. https://www.youtube.com/watch?v=-KY1pDLulF4
https://docs.google.com/forms/d/e/1FAIpQLSf_8zHD2cTtoFzsRsmTl5BCKM1ZmtHlBEkQjk_RTGg7rTkaFg/viewform?usp=sf_link