Andrew Johnson and Alaska. (2013). The History Channel website. Retrieved 10:59, June 19, 2013, from http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives.
Andrew Johnson and Alaska. [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].
“Andrew Johnson and Alaska.” 2013. The History Channel website. Jun 19 2013, 10:59 http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives.
“Andrew Johnson and Alaska,” The History Channel website, 2013, http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives [accessed Jun 19, 2013].
“Andrew Johnson and Alaska,” The History Channel website, http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives (accessed Jun 19, 2013).
Andrew Johnson and Alaska [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.
Andrew Johnson and Alaska, http://www.history.com/shows/the-ultimate-guide-to-the-presidents/videos/playlists/web-exclusives (last visited Jun 19, 2013).
Andrew Johnson and Alaska. 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.