The resources below are books, articles, and other media that are useful references for aspects of this topic. When they are complete, each reference will be described and tagged. See here for an example of a more or less complete entry.
Burr, William. "Consultation is Presidential Business": Secret Understandings on the Use of Nuclear Weapons, 1950-1974. Electronic Briefing Book No. 159. Washington, D.C.: National Security Archive, 2005. https://nsarchive2.gwu.edu/NSAEBB/NSAEBB159/.
Burr, William. Presidential Control of Nuclear Weapons: The "Football." Briefing Book #632. Washington, D.C.: National Security Archive, 2018. https://nsarchive.gwu.edu/briefing-book/nuclear-vault/2018-07-09/presidential-control-nuclear-weapons-football.