Zebulon Pike spots an imposing mountain. (2013). The History Channel website. Retrieved 8:46, May 18, 2013, from http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain.
Zebulon Pike spots an imposing mountain. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain [Accessed 18 May 2013].
“Zebulon Pike spots an imposing mountain.” 2013. The History Channel website. May 18 2013, 8:46 http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain.
“Zebulon Pike spots an imposing mountain,” The History Channel website, 2013, http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain [accessed May 18, 2013].
“Zebulon Pike spots an imposing mountain,” The History Channel website, http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain (accessed May 18, 2013).
Zebulon Pike spots an imposing mountain [Internet]. The History Channel website; 2013 [cited 2013 May 18] Available from: http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain.
Zebulon Pike spots an imposing mountain, http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain (last visited May 18, 2013).
Zebulon Pike spots an imposing mountain. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/zebulon-pike-spots-an-imposing-mountain. Accessed May 18, 2013.