Thunderbird Explained. (2013). The History Channel website. Retrieved 8:20, May 24, 2013, from http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures.
Thunderbird Explained. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures [Accessed 24 May 2013].
“Thunderbird Explained.” 2013. The History Channel website. May 24 2013, 8:20 http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures.
“Thunderbird Explained,” The History Channel website, 2013, http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures [accessed May 24, 2013].
“Thunderbird Explained,” The History Channel website, http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures (accessed May 24, 2013).
Thunderbird Explained [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures.
Thunderbird Explained, http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures (last visited May 24, 2013).
Thunderbird Explained. The History Channel website. 2013. Available at: http://www.history.com/shows/monsterquest/videos/playlists/birdzilla-and-flying-creatures. Accessed May 24, 2013.