Science of Earthquakes. (2013). The History Channel website. Retrieved 5:54, May 21, 2013, from http://www.history.com/videos/the-science-of-earthquakes.
Science of Earthquakes. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/videos/the-science-of-earthquakes [Accessed 21 May 2013].
“Science of Earthquakes.” 2013. The History Channel website. May 21 2013, 5:54 http://www.history.com/videos/the-science-of-earthquakes.
“Science of Earthquakes,” The History Channel website, 2013, http://www.history.com/videos/the-science-of-earthquakes [accessed May 21, 2013].
“Science of Earthquakes,” The History Channel website, http://www.history.com/videos/the-science-of-earthquakes (accessed May 21, 2013).
Science of Earthquakes [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/videos/the-science-of-earthquakes.
Science of Earthquakes, http://www.history.com/videos/the-science-of-earthquakes (last visited May 21, 2013).
Science of Earthquakes. The History Channel website. 2013. Available at: http://www.history.com/videos/the-science-of-earthquakes. Accessed May 21, 2013.