The Universe: Backyard Astronomer - The Constellations. (2013). The History Channel website. Retrieved 7:17, May 19, 2013, from http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations.
The Universe: Backyard Astronomer - The Constellations. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations [Accessed 19 May 2013].
“The Universe: Backyard Astronomer - The Constellations.” 2013. The History Channel website. May 19 2013, 7:17 http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations.
“The Universe: Backyard Astronomer - The Constellations,” The History Channel website, 2013, http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations [accessed May 19, 2013].
“The Universe: Backyard Astronomer - The Constellations,” The History Channel website, http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations (accessed May 19, 2013).
The Universe: Backyard Astronomer - The Constellations [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations.
The Universe: Backyard Astronomer - The Constellations, http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations (last visited May 19, 2013).
The Universe: Backyard Astronomer - The Constellations. The History Channel website. 2013. Available at: http://www.history.com/videos/the-universe-backyard-astronomer---the-constellations. Accessed May 19, 2013.