March of the Penguins debuts. (2013). The History Channel website. Retrieved 5:25, May 25, 2013, from http://www.history.com/this-day-in-history/march-of-the-penguins-debuts.
March of the Penguins debuts. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/march-of-the-penguins-debuts [Accessed 25 May 2013].
“March of the Penguins debuts.” 2013. The History Channel website. May 25 2013, 5:25 http://www.history.com/this-day-in-history/march-of-the-penguins-debuts.
“March of the Penguins debuts,” The History Channel website, 2013, http://www.history.com/this-day-in-history/march-of-the-penguins-debuts [accessed May 25, 2013].
“March of the Penguins debuts,” The History Channel website, http://www.history.com/this-day-in-history/march-of-the-penguins-debuts (accessed May 25, 2013).
March of the Penguins debuts [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/march-of-the-penguins-debuts.
March of the Penguins debuts, http://www.history.com/this-day-in-history/march-of-the-penguins-debuts (last visited May 25, 2013).
March of the Penguins debuts. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/march-of-the-penguins-debuts. Accessed May 25, 2013.