Mankind and Invention. (2013). The History Channel website. Retrieved 6:13, May 24, 2013, from http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives.
Mankind and Invention. [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 24 May 2013].
“Mankind and Invention.” 2013. The History Channel website. May 24 2013, 6:13 http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives.
“Mankind and Invention,” The History Channel website, 2013, http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives [accessed May 24, 2013].
“Mankind and Invention,” The History Channel website, http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives (accessed May 24, 2013).
Mankind and Invention [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives.
Mankind and Invention, http://www.history.com/shows/mankind-the-story-of-all-of-us/videos/playlists/web-exclusives (last visited May 24, 2013).
Mankind and Invention. 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 24, 2013.