Sources:
Images and photographs: http://images.google.com
All of the below:
Timeline: http://www.livescience.com/20718-computer-history.html
http://www.computerhistory.org/timeline/?category=cmptr
http://study.com/academy/lesson/history-of-computers-timeline-evolution.html
http://www.computerhope.com/history/
http://anddum.com/timeline/history_short.htm
John Atanasoff: http://www.columbia.edu/~td2177/JVAtanasoff/JVAtanasoff.html
http://www.biography.com/people/john-atanasoff-9191377
http://www.johnatanasoff.com/biography.php?sub=basic_facts
http://history-computer.com/People/AtanasoffBio.html
http://history-computer.com/ModernComputer/Electronic/Atanasoff.html
http://www.computerhistory.org/revolution/birth-of-the-computer/4/99
Alan Turing: Alan Turing: The Enigma by Andrew Hodges
The Imitation Game, directed by Morten Tyldum
http://en.wikipedia.org/wiki/The_Imitation_Game
http://www.turing.org.uk/book/
http://www.bookdepository.com/Alan-Turing-Enigma-Andrew-Hodges/9781784700089
http://www.biography.com/people/alan-turing-9512017
http://www.turing.org.uk/scrapbook/ace.html
ENIGMA: http://www.openculture.com/2013/01/the_enigma_machine_how_alan_turing_helped_break_the_unbreakable_nazi_code_.html
http://www.computerhistory.org/revolution/birth-of-the-computer/4/82
http://crypto.stackexchange.com/questions/13150/how-cryptographically-secure-was-the-original-ww2-enigma-machine-from-a-modern
ENIAC: http://www.turing.org.uk/scrapbook/computer.html
http://en.wikipedia.org/wiki/ENIAC
http://www.columbia.edu/cu/computinghistory/eniac.html
All of the below:
Timeline: http://www.livescience.com/20718-computer-history.html
http://www.computerhistory.org/timeline/?category=cmptr
http://study.com/academy/lesson/history-of-computers-timeline-evolution.html
http://www.computerhope.com/history/
http://anddum.com/timeline/history_short.htm
John Atanasoff: http://www.columbia.edu/~td2177/JVAtanasoff/JVAtanasoff.html
http://www.biography.com/people/john-atanasoff-9191377
http://www.johnatanasoff.com/biography.php?sub=basic_facts
http://history-computer.com/People/AtanasoffBio.html
http://history-computer.com/ModernComputer/Electronic/Atanasoff.html
http://www.computerhistory.org/revolution/birth-of-the-computer/4/99
Alan Turing: Alan Turing: The Enigma by Andrew Hodges
The Imitation Game, directed by Morten Tyldum
http://en.wikipedia.org/wiki/The_Imitation_Game
http://www.turing.org.uk/book/
http://www.bookdepository.com/Alan-Turing-Enigma-Andrew-Hodges/9781784700089
http://www.biography.com/people/alan-turing-9512017
http://www.turing.org.uk/scrapbook/ace.html
ENIGMA: http://www.openculture.com/2013/01/the_enigma_machine_how_alan_turing_helped_break_the_unbreakable_nazi_code_.html
http://www.computerhistory.org/revolution/birth-of-the-computer/4/82
http://crypto.stackexchange.com/questions/13150/how-cryptographically-secure-was-the-original-ww2-enigma-machine-from-a-modern
ENIAC: http://www.turing.org.uk/scrapbook/computer.html
http://en.wikipedia.org/wiki/ENIAC
http://www.columbia.edu/cu/computinghistory/eniac.html