Harriet Tubman and the Underground Railroad. (2013). The History Channel website. Retrieved 10:27, May 25, 2013, from http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives.
Harriet Tubman and the Underground Railroad. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives [Accessed 25 May 2013].
“Harriet Tubman and the Underground Railroad.” 2013. The History Channel website. May 25 2013, 10:27 http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives.
“Harriet Tubman and the Underground Railroad,” The History Channel website, 2013, http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives [accessed May 25, 2013].
“Harriet Tubman and the Underground Railroad,” The History Channel website, http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives (accessed May 25, 2013).
Harriet Tubman and the Underground Railroad [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives.
Harriet Tubman and the Underground Railroad, http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives (last visited May 25, 2013).
Harriet Tubman and the Underground Railroad. The History Channel website. 2013. Available at: http://www.history.com/shows/america-the-story-of-us/videos/playlists/web-exclusives. Accessed May 25, 2013.