The Birth of Telecommunications. (2013). The History Channel website. Retrieved 12:19, May 26, 2013, from http://www.history.com/videos/the-telegraph-and-telephone.
The Birth of Telecommunications. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/videos/the-telegraph-and-telephone [Accessed 26 May 2013].
“The Birth of Telecommunications.” 2013. The History Channel website. May 26 2013, 12:19 http://www.history.com/videos/the-telegraph-and-telephone.
“The Birth of Telecommunications,” The History Channel website, 2013, http://www.history.com/videos/the-telegraph-and-telephone [accessed May 26, 2013].
“The Birth of Telecommunications,” The History Channel website, http://www.history.com/videos/the-telegraph-and-telephone (accessed May 26, 2013).
The Birth of Telecommunications [Internet]. The History Channel website; 2013 [cited 2013 May 26] Available from: http://www.history.com/videos/the-telegraph-and-telephone.
The Birth of Telecommunications, http://www.history.com/videos/the-telegraph-and-telephone (last visited May 26, 2013).
The Birth of Telecommunications. The History Channel website. 2013. Available at: http://www.history.com/videos/the-telegraph-and-telephone. Accessed May 26, 2013.