First generation:
http://people.bu.edu/baws/brief%20computer%20history.html
http://jva.cs.iastate.edu/mauchlyinames.php
http://history-computer.com/ModernComputer/Electronic/Colossus.html
http://www.britannica.com/EBchecked/topic/183842/ENIAC
Second Generation:
http://people.bu.edu/baws/brief%20computer%20history.html
http://www.thocp.net/hardware/univac.htm
http://inventors.about.com/od/computersandinternet/a/IBM701.htm
Third Generation:
http://people.bu.edu/baws/brief%20computer%20history.html
http://windows.microsoft.com/en-us/windows/history#T1=era0
http://www.history.com/topics/inventions/invention-of-the-pc
http://people.bu.edu/baws/brief%20computer%20history.html
http://jva.cs.iastate.edu/mauchlyinames.php
http://history-computer.com/ModernComputer/Electronic/Colossus.html
http://www.britannica.com/EBchecked/topic/183842/ENIAC
Second Generation:
http://people.bu.edu/baws/brief%20computer%20history.html
http://www.thocp.net/hardware/univac.htm
http://inventors.about.com/od/computersandinternet/a/IBM701.htm
Third Generation:
http://people.bu.edu/baws/brief%20computer%20history.html
http://windows.microsoft.com/en-us/windows/history#T1=era0
http://www.history.com/topics/inventions/invention-of-the-pc