Union ships pass Vicksburg. (2013). The History Channel website. Retrieved 6:34, May 21, 2013, from http://www.history.com/this-day-in-history/passage-of-vicksburg.
Union ships pass Vicksburg. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/passage-of-vicksburg [Accessed 21 May 2013].
“Union ships pass Vicksburg.” 2013. The History Channel website. May 21 2013, 6:34 http://www.history.com/this-day-in-history/passage-of-vicksburg.
“Union ships pass Vicksburg,” The History Channel website, 2013, http://www.history.com/this-day-in-history/passage-of-vicksburg [accessed May 21, 2013].
“Union ships pass Vicksburg,” The History Channel website, http://www.history.com/this-day-in-history/passage-of-vicksburg (accessed May 21, 2013).
Union ships pass Vicksburg [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/passage-of-vicksburg.
Union ships pass Vicksburg, http://www.history.com/this-day-in-history/passage-of-vicksburg (last visited May 21, 2013).
Union ships pass Vicksburg. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/passage-of-vicksburg. Accessed May 21, 2013.