Revolutions. (2013). The History Channel website. Retrieved 4:26, May 20, 2013, from http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
Revolutions. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide [Accessed 20 May 2013].
“Revolutions.” 2013. The History Channel website. May 20 2013, 4:26 http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
“Revolutions,” The History Channel website, 2013, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide [accessed May 20, 2013].
“Revolutions,” The History Channel website, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide (accessed May 20, 2013).
Revolutions [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
Revolutions, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide (last visited May 20, 2013).
Revolutions. The History Channel website. 2013. Available at: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide. Accessed May 20, 2013.