Harriet Tubman and the Underground Railroad. (2013). The History Channel website. Retrieved 12:44, June 19, 2013, from http://www.history.com/videos/harriet-tubman-and-the-underground-railroad.
Harriet Tubman and the Underground Railroad. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/videos/harriet-tubman-and-the-underground-railroad [Accessed 19 Jun 2013].
“Harriet Tubman and the Underground Railroad.” 2013. The History Channel website. Jun 19 2013, 12:44 http://www.history.com/videos/harriet-tubman-and-the-underground-railroad.
“Harriet Tubman and the Underground Railroad,” The History Channel website, 2013, http://www.history.com/videos/harriet-tubman-and-the-underground-railroad [accessed Jun 19, 2013].
“Harriet Tubman and the Underground Railroad,” The History Channel website, http://www.history.com/videos/harriet-tubman-and-the-underground-railroad (accessed Jun 19, 2013).
Harriet Tubman and the Underground Railroad [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/videos/harriet-tubman-and-the-underground-railroad.
Harriet Tubman and the Underground Railroad, http://www.history.com/videos/harriet-tubman-and-the-underground-railroad (last visited Jun 19, 2013).
Harriet Tubman and the Underground Railroad. The History Channel website. 2013. Available at: http://www.history.com/videos/harriet-tubman-and-the-underground-railroad. Accessed Jun 19, 2013.