How The Earth Was Made:. (2013). The History Channel website. Retrieved 6:07, May 21, 2013, from http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes.
How The Earth Was Made:. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes [Accessed 21 May 2013].
“How The Earth Was Made:.” 2013. The History Channel website. May 21 2013, 6:07 http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes.
“How The Earth Was Made:,” The History Channel website, 2013, http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes [accessed May 21, 2013].
“How The Earth Was Made:,” The History Channel website, http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes (accessed May 21, 2013).
How The Earth Was Made: [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes.
How The Earth Was Made:, http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes (last visited May 21, 2013).
How The Earth Was Made:. The History Channel website. 2013. Available at: http://www.history.com/shows/how-the-earth-was-made/videos/playlists/full-episodes. Accessed May 21, 2013.