Supreme Court rules in Dred Scott case. (2013). The History Channel website. Retrieved 2:20, June 20, 2013, from http://www.history.com/this-day-in-history/dred-scott-decision.
Supreme Court rules in Dred Scott case. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/dred-scott-decision [Accessed 20 Jun 2013].
“Supreme Court rules in Dred Scott case.” 2013. The History Channel website. Jun 20 2013, 2:20 http://www.history.com/this-day-in-history/dred-scott-decision.
“Supreme Court rules in Dred Scott case,” The History Channel website, 2013, http://www.history.com/this-day-in-history/dred-scott-decision [accessed Jun 20, 2013].
“Supreme Court rules in Dred Scott case,” The History Channel website, http://www.history.com/this-day-in-history/dred-scott-decision (accessed Jun 20, 2013).
Supreme Court rules in Dred Scott case [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/dred-scott-decision.
Supreme Court rules in Dred Scott case, http://www.history.com/this-day-in-history/dred-scott-decision (last visited Jun 20, 2013).
Supreme Court rules in Dred Scott case. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/dred-scott-decision. Accessed Jun 20, 2013.