From the Pencil to the Keypad. (2013). The History Channel website. Retrieved 5:07, May 18, 2013, from http://www.history.com/videos/who-invented-the-computer.
From the Pencil to the Keypad. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/videos/who-invented-the-computer [Accessed 18 May 2013].
“From the Pencil to the Keypad.” 2013. The History Channel website. May 18 2013, 5:07 http://www.history.com/videos/who-invented-the-computer.
“From the Pencil to the Keypad,” The History Channel website, 2013, http://www.history.com/videos/who-invented-the-computer [accessed May 18, 2013].
“From the Pencil to the Keypad,” The History Channel website, http://www.history.com/videos/who-invented-the-computer (accessed May 18, 2013).
From the Pencil to the Keypad [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/videos/who-invented-the-computer.
From the Pencil to the Keypad, http://www.history.com/videos/who-invented-the-computer (last visited May 18, 2013).
From the Pencil to the Keypad. The History Channel website. 2013. Available at: http://www.history.com/videos/who-invented-the-computer. Accessed May 18, 2013.