Abraham Lincoln: Death Threats. (2013). The History Channel website. Retrieved 7:33, June 19, 2013, from http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives.
Abraham Lincoln: Death Threats. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives [Accessed 19 Jun 2013].
“Abraham Lincoln: Death Threats.” 2013. The History Channel website. Jun 19 2013, 7:33 http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives.
“Abraham Lincoln: Death Threats,” The History Channel website, 2013, http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives [accessed Jun 19, 2013].
“Abraham Lincoln: Death Threats,” The History Channel website, http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives (accessed Jun 19, 2013).
Abraham Lincoln: Death Threats [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives.
Abraham Lincoln: Death Threats, http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives (last visited Jun 19, 2013).
Abraham Lincoln: Death Threats. The History Channel website. 2013. Available at: http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives. Accessed Jun 19, 2013.