The 13th Amendment is ratified. (2013). The History Channel website. Retrieved 8:06, May 25, 2013, from http://www.history.com/this-day-in-history/13th-amendment-ratified.
The 13th Amendment is ratified. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/13th-amendment-ratified [Accessed 25 May 2013].
“The 13th Amendment is ratified.” 2013. The History Channel website. May 25 2013, 8:06 http://www.history.com/this-day-in-history/13th-amendment-ratified.
“The 13th Amendment is ratified,” The History Channel website, 2013, http://www.history.com/this-day-in-history/13th-amendment-ratified [accessed May 25, 2013].
“The 13th Amendment is ratified,” The History Channel website, http://www.history.com/this-day-in-history/13th-amendment-ratified (accessed May 25, 2013).
The 13th Amendment is ratified [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/13th-amendment-ratified.
The 13th Amendment is ratified, http://www.history.com/this-day-in-history/13th-amendment-ratified (last visited May 25, 2013).
The 13th Amendment is ratified. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/13th-amendment-ratified. Accessed May 25, 2013.