The Deepest Place on Earth. (2013). The History Channel website. Retrieved 1:50, May 21, 2013, from http://www.history.com/shows/how-the-earth-was-made/episodes/season-1.
The Deepest Place on Earth. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/how-the-earth-was-made/episodes/season-1 [Accessed 21 May 2013].
“The Deepest Place on Earth.” 2013. The History Channel website. May 21 2013, 1:50 http://www.history.com/shows/how-the-earth-was-made/episodes/season-1.
“The Deepest Place on Earth,” The History Channel website, 2013, http://www.history.com/shows/how-the-earth-was-made/episodes/season-1 [accessed May 21, 2013].
“The Deepest Place on Earth,” The History Channel website, http://www.history.com/shows/how-the-earth-was-made/episodes/season-1 (accessed May 21, 2013).
The Deepest Place on Earth [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/shows/how-the-earth-was-made/episodes/season-1.
The Deepest Place on Earth, http://www.history.com/shows/how-the-earth-was-made/episodes/season-1 (last visited May 21, 2013).
The Deepest Place on Earth. The History Channel website. 2013. Available at: http://www.history.com/shows/how-the-earth-was-made/episodes/season-1. Accessed May 21, 2013.