Columbus Sails West. (2013). The History Channel website. Retrieved 2:25, May 18, 2013, from http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives.
Columbus Sails West. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives [Accessed 18 May 2013].
“Columbus Sails West.” 2013. The History Channel website. May 18 2013, 2:25 http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives.
“Columbus Sails West,” The History Channel website, 2013, http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives [accessed May 18, 2013].
“Columbus Sails West,” The History Channel website, http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives (accessed May 18, 2013).
Columbus Sails West [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives.
Columbus Sails West, http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives (last visited May 18, 2013).
Columbus Sails West. The History Channel website. 2013. Available at: http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives. Accessed May 18, 2013.