Alexander Mackenzie reaches the Pacific Ocean. (2013). The History Channel website. Retrieved 8:31, May 20, 2013, from http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean.
Alexander Mackenzie reaches the Pacific Ocean. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean [Accessed 20 May 2013].
“Alexander Mackenzie reaches the Pacific Ocean.” 2013. The History Channel website. May 20 2013, 8:31 http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean.
“Alexander Mackenzie reaches the Pacific Ocean,” The History Channel website, 2013, http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean [accessed May 20, 2013].
“Alexander Mackenzie reaches the Pacific Ocean,” The History Channel website, http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean (accessed May 20, 2013).
Alexander Mackenzie reaches the Pacific Ocean [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean.
Alexander Mackenzie reaches the Pacific Ocean, http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean (last visited May 20, 2013).
Alexander Mackenzie reaches the Pacific Ocean. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/alexander-mackenzie-reaches-the-pacific-ocean. Accessed May 20, 2013.