Grand Central Station. (2013). The History Channel website. Retrieved 6:01, May 18, 2013, from http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people.
Grand Central Station. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people [Accessed 18 May 2013].
“Grand Central Station.” 2013. The History Channel website. May 18 2013, 6:01 http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people.
“Grand Central Station,” The History Channel website, 2013, http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people [accessed May 18, 2013].
“Grand Central Station,” The History Channel website, http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people (accessed May 18, 2013).
Grand Central Station [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people.
Grand Central Station, http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people (last visited May 18, 2013).
Grand Central Station. The History Channel website. 2013. Available at: http://www.history.com/shows/life-after-people/videos/playlists/what-will-happen-after-people. Accessed May 18, 2013.