Cities of the Underworld 3: Stalin's Communications Bunker. (2013). The History Channel website. Retrieved 2:06, May 23, 2013, from http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives.
Cities of the Underworld 3: Stalin's Communications Bunker. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives [Accessed 23 May 2013].
“Cities of the Underworld 3: Stalin's Communications Bunker.” 2013. The History Channel website. May 23 2013, 2:06 http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives.
“Cities of the Underworld 3: Stalin's Communications Bunker,” The History Channel website, 2013, http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives [accessed May 23, 2013].
“Cities of the Underworld 3: Stalin's Communications Bunker,” The History Channel website, http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives (accessed May 23, 2013).
Cities of the Underworld 3: Stalin's Communications Bunker [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives.
Cities of the Underworld 3: Stalin's Communications Bunker, http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives (last visited May 23, 2013).
Cities of the Underworld 3: Stalin's Communications Bunker. The History Channel website. 2013. Available at: http://www.history.com/shows/cities-of-the-underworld/videos/playlists/exclusives. Accessed May 23, 2013.