Supreme Court rules in Dred Scott case. (2013). The History Channel website. Retrieved 8:56, May 20, 2013, from http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case.
Supreme Court rules in Dred Scott case. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case [Accessed 20 May 2013].
“Supreme Court rules in Dred Scott case.” 2013. The History Channel website. May 20 2013, 8:56 http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case.
“Supreme Court rules in Dred Scott case,” The History Channel website, 2013, http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case [accessed May 20, 2013].
“Supreme Court rules in Dred Scott case,” The History Channel website, http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case (accessed May 20, 2013).
Supreme Court rules in Dred Scott case [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case.
Supreme Court rules in Dred Scott case, http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case (last visited May 20, 2013).
Supreme Court rules in Dred Scott case. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/supreme-court-rules-in-dred-scott-case. Accessed May 20, 2013.