New York Harbor. (2013). The History Channel website. Retrieved 8:47, May 22, 2013, from http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives.
New York Harbor. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives [Accessed 22 May 2013].
“New York Harbor.” 2013. The History Channel website. May 22 2013, 8:47 http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives.
“New York Harbor,” The History Channel website, 2013, http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives [accessed May 22, 2013].
“New York Harbor,” The History Channel website, http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives (accessed May 22, 2013).
New York Harbor [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives.
New York Harbor, http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives (last visited May 22, 2013).
New York Harbor. The History Channel website. 2013. Available at: http://www.history.com/shows/how-the-earth-was-made/videos/playlists/web-exclusives. Accessed May 22, 2013.