Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole. (2013). The History Channel website. Retrieved 3:47, May 24, 2013, from http://www.history.com/.
Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/ [Accessed 24 May 2013].
“Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole.” 2013. The History Channel website. May 24 2013, 3:47 http://www.history.com/.
“Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole,” The History Channel website, 2013, http://www.history.com/ [accessed May 24, 2013].
“Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole,” The History Channel website, http://www.history.com/ (accessed May 24, 2013).
Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/.
Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole, http://www.history.com/ (last visited May 24, 2013).
Byrd flies over the North Pole?path=/this-day-in-history/byrd-flies-over-the-north-pole. The History Channel website. 2013. Available at: http://www.history.com/. Accessed May 24, 2013.