https://www.defense.gov/Multimedia/Experience/Americas-Nuclear-Triad/

https://sgs.princeton.edu/the-lab/plan-a

https://www.cnbc.com/2017/08/18/this-is-the-process-the-us-uses-to-authorize-a-nuclear-strike.html

https://www.bloomberg.com/politics/graphics/2016-nuclear-weapon-launch/#xj4y7vzkg

https://www.businessinsider.com/nuclear-bomb-launch-procedure-us-government-president-2017-11

https://www.youtube.com/watch?v=Hh-yZLpMmGA

https://www.armscontrol.org/act/2021-06/features/nuclear-launch-authority-too-big-decision-just-president

https://www.osti.gov/servlets/purl/1374246

https://nap.nationalacademies.org/read/24964/chapter/5#34