How the States Got Their Shapes: The United Shapes of America. (2013). The History Channel website. Retrieved 12:06, May 20, 2013, from http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/.
How the States Got Their Shapes: The United Shapes of America. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/ [Accessed 20 May 2013].
“How the States Got Their Shapes: The United Shapes of America.” 2013. The History Channel website. May 20 2013, 12:06 http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/.
“How the States Got Their Shapes: The United Shapes of America,” The History Channel website, 2013, http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/ [accessed May 20, 2013].
“How the States Got Their Shapes: The United Shapes of America,” The History Channel website, http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/ (accessed May 20, 2013).
How the States Got Their Shapes: The United Shapes of America [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/.
How the States Got Their Shapes: The United Shapes of America, http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/ (last visited May 20, 2013).
How the States Got Their Shapes: The United Shapes of America. The History Channel website. 2013. Available at: http://www.history.com/shows/how-the-states-got-their-shapes/videos/playlists/. Accessed May 20, 2013.