World's Oldest Recording. (2013). The History Channel website. Retrieved 8:11, May 24, 2013, from http://www.history.com/speeches/worlds-oldest-recording.
World's Oldest Recording. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/speeches/worlds-oldest-recording [Accessed 24 May 2013].
“World's Oldest Recording.” 2013. The History Channel website. May 24 2013, 8:11 http://www.history.com/speeches/worlds-oldest-recording.
“World's Oldest Recording,” The History Channel website, 2013, http://www.history.com/speeches/worlds-oldest-recording [accessed May 24, 2013].
“World's Oldest Recording,” The History Channel website, http://www.history.com/speeches/worlds-oldest-recording (accessed May 24, 2013).
World's Oldest Recording [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/speeches/worlds-oldest-recording.
World's Oldest Recording, http://www.history.com/speeches/worlds-oldest-recording (last visited May 24, 2013).
World's Oldest Recording. The History Channel website. 2013. Available at: http://www.history.com/speeches/worlds-oldest-recording. Accessed May 24, 2013.