Amundsen reaches South Pole. (2013). The History Channel website. Retrieved 1:10, May 25, 2013, from http://www.history.com/this-day-in-history/amundsen-reaches-south-pole.
Amundsen reaches South Pole. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/amundsen-reaches-south-pole [Accessed 25 May 2013].
“Amundsen reaches South Pole.” 2013. The History Channel website. May 25 2013, 1:10 http://www.history.com/this-day-in-history/amundsen-reaches-south-pole.
“Amundsen reaches South Pole,” The History Channel website, 2013, http://www.history.com/this-day-in-history/amundsen-reaches-south-pole [accessed May 25, 2013].
“Amundsen reaches South Pole,” The History Channel website, http://www.history.com/this-day-in-history/amundsen-reaches-south-pole (accessed May 25, 2013).
Amundsen reaches South Pole [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/amundsen-reaches-south-pole.
Amundsen reaches South Pole, http://www.history.com/this-day-in-history/amundsen-reaches-south-pole (last visited May 25, 2013).
Amundsen reaches South Pole. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/amundsen-reaches-south-pole. Accessed May 25, 2013.