Hofstadter, Douglas R.:Metamagical Themas: Questing for the Essence of Mind and Pattern.Basic Books, 1985.ISBN0465045669Teoksen verkkoversioViitattu 23.6.2018.(englanniksi)
Christof Teuscher:Alan Turing: Life and Legacy of a Great Thinker.Springer-Verlag, 2004.ISBN3-540-20020-7Teoksen verkkoversioViitattu 23.6.2018.(englanniksi)
Jones, G James:A Pioneer for a New Century -- Alan Turing, part 1.Linux Gazette...,2002, nro 75.Artikkelin verkkoversio.Viitattu 23.6.2018.Originally published at System Toolbox. Reprinted with permission.(englanniksi)
"This loss shattered Turing's religious faith and led him into atheism..." Time 100 profile of Alan Turing s. 2.time.com.Arkistoitu22.8.2008. Viitattu 23.6.2018 (englanniksi).
"This loss shattered Turing's religious faith and led him into atheism..." Time 100 profile of Alan Turing s. 2.time.com.Arkistoitu22.8.2008. Viitattu 23.6.2018 (englanniksi).