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.
Colangelo, Anthony J. "The Duty to Disobey Illegal Nuclear Strike Orders." SMU Dedman School of Law Legal Studies Research Paper No. 368. Harvard National Security Journal 9 (August 2018): https://ssrn.com/abstract=3048979.
Critchlow, Robert D. Nuclear Command and Control: Current Programs and Issues. CRS Report No. RL33408. Washington, D.C.: Congressional Research Service, 2006. https://fas.org/sgp/crs/nuke/RL33408.pdf.
Hering, Harold. "Nukes." Interview with Latif Nasser. Radiolab. Podcast audio, April 7, 2017. https://www.wnycstudios.org/story/nukes.
Rosenbaum, Ron. "An Unsung Hero of the Nuclear Age: Maj. Harold Hering and the forbidden question that cost him his career." Slate, February 28, 2011. http://www.slate.com/articles/life/the_spectator/2011/02/an_unsung_hero_of_the_nuclear_age.single.html.
Wellerstein, Alex. "No one can stop President Trump from using nuclear weapons. That's by design." Washington Post, December 1, 2016. https://www.washingtonpost.com/posteverything/wp/2016/12/01/no-one-can-stop-president-trump-from-using-nuclear-weapons-thats-by-design/?noredirect=on&utm_term=.05b5b6a7fe06.