New Frontiers. (2013). The History Channel website. Retrieved 9:42, May 22, 2013, from http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
New Frontiers. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide [Accessed 22 May 2013].
“New Frontiers.” 2013. The History Channel website. May 22 2013, 9:42 http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
“New Frontiers,” The History Channel website, 2013, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide [accessed May 22, 2013].
“New Frontiers,” The History Channel website, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide (accessed May 22, 2013).
New Frontiers [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
New Frontiers, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide (last visited May 22, 2013).
New Frontiers. The History Channel website. 2013. Available at: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide. Accessed May 22, 2013.