Mason and Dixon draw a line. (2013). The History Channel website. Retrieved 11:31, May 21, 2013, from http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line.
Mason and Dixon draw a line. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line [Accessed 21 May 2013].
“Mason and Dixon draw a line.” 2013. The History Channel website. May 21 2013, 11:31 http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line.
“Mason and Dixon draw a line,” The History Channel website, 2013, http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line [accessed May 21, 2013].
“Mason and Dixon draw a line,” The History Channel website, http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line (accessed May 21, 2013).
Mason and Dixon draw a line [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line.
Mason and Dixon draw a line, http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line (last visited May 21, 2013).
Mason and Dixon draw a line. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/mason-and-dixon-draw-a-line. Accessed May 21, 2013.