bibiliography
- http://homepage.cs.uri.edu/faculty/wolfe/book/Readings/Reading03.htm
- n.wikipedia.org/wiki/Computer
- http://www.computerhistory.org/timeline/?category=cmptr#top
- http://www.gcflearnfree.org/computerbasics/1
- http://www.ftbendliteracy.org/computer-skills.htm
- http://anddum.com/timeline/history_short.htm