U.S.-Canadian border established. (2013). The History Channel website. Retrieved 9:43, May 19, 2013, from http://www.history.com/this-day-in-history/us-canadian-border-established.
U.S.-Canadian border established. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/us-canadian-border-established [Accessed 19 May 2013].
“U.S.-Canadian border established.” 2013. The History Channel website. May 19 2013, 9:43 http://www.history.com/this-day-in-history/us-canadian-border-established.
“U.S.-Canadian border established,” The History Channel website, 2013, http://www.history.com/this-day-in-history/us-canadian-border-established [accessed May 19, 2013].
“U.S.-Canadian border established,” The History Channel website, http://www.history.com/this-day-in-history/us-canadian-border-established (accessed May 19, 2013).
U.S.-Canadian border established [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/us-canadian-border-established.
U.S.-Canadian border established, http://www.history.com/this-day-in-history/us-canadian-border-established (last visited May 19, 2013).
U.S.-Canadian border established. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/us-canadian-border-established. Accessed May 19, 2013.