1. AA Central Office of Salt Lake. (2015). Spiritus contra spiritum–Carl Jung’s letter to Bill Wilson January 30, 1961. The Blog. https://www.saltlakeaa.org/2015/01/spiritus-contra-spiritum-carl-jungs-letter-to-bill-wilson-january-30-1961/
2. AA Grapevine. (1963, January). The Bill W.–Carl Jung Letters. AA Grapevine: The International Journal of Alcoholics Anonymous. https://www.aagrapevine.org/magazine/1963/jan/bill-w-carl-jung-letters