CHRISTOPHER KLEIN. The Guillotine’s First Cut
https://www.history.com/news/the-guillotines-first-cut

Encyclopedia Britannica
https://www.britannica.com/topic/beheading
https://www.britannica.com/topic/guillotine

Evan Andrews. 8 Things You May Not Know About the Guillotine.
https://www.history.com/news/8-things-you-may-not-know-about-the-guillotine

How long does the brain remain conscious after decapitation?
https://www.independent.co.uk/life-style/health-and-families/health-news/decapitation-survive-speak-anne-boleyn-henry-viii-conscious-brain-a8886126.html

Top Ten Myths About the Brain
https://science.howstuffworks.com/life/inside-the-mind/human-brain/10-brain-myths6.htm

Do You Really Stay Conscious After Being Decapitated?
https://science.howstuffworks.com/science-vs-myth/extrasensory-perceptions/lucid-decapitation2.htm