Lincoln-Douglas debates begin. (2013). The History Channel website. Retrieved 6:20, May 21, 2013, from http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin.
Lincoln-Douglas debates begin. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin [Accessed 21 May 2013].
“Lincoln-Douglas debates begin.” 2013. The History Channel website. May 21 2013, 6:20 http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin.
“Lincoln-Douglas debates begin,” The History Channel website, 2013, http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin [accessed May 21, 2013].
“Lincoln-Douglas debates begin,” The History Channel website, http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin (accessed May 21, 2013).
Lincoln-Douglas debates begin [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin.
Lincoln-Douglas debates begin, http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin (last visited May 21, 2013).
Lincoln-Douglas debates begin. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/lincoln-douglas-debates-begin. Accessed May 21, 2013.