Plague. (2013). The History Channel website. Retrieved 11:35, May 23, 2013, from http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
Plague. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide [Accessed 23 May 2013].
“Plague.” 2013. The History Channel website. May 23 2013, 11:35 http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
“Plague,” The History Channel website, 2013, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide [accessed May 23, 2013].
“Plague,” The History Channel website, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide (accessed May 23, 2013).
Plague [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide.
Plague, http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide (last visited May 23, 2013).
Plague. The History Channel website. 2013. Available at: http://www.history.com/shows/mankind-the-story-of-all-of-us/episodes/episode-guide. Accessed May 23, 2013.