Tornadoes devastate Nebraska. (2013). The History Channel website. Retrieved 7:24, May 19, 2013, from http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska.
Tornadoes devastate Nebraska. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska [Accessed 19 May 2013].
“Tornadoes devastate Nebraska.” 2013. The History Channel website. May 19 2013, 7:24 http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska.
“Tornadoes devastate Nebraska,” The History Channel website, 2013, http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska [accessed May 19, 2013].
“Tornadoes devastate Nebraska,” The History Channel website, http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska (accessed May 19, 2013).
Tornadoes devastate Nebraska [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska.
Tornadoes devastate Nebraska, http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska (last visited May 19, 2013).
Tornadoes devastate Nebraska. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/tornadoes-devastate-nebraska. Accessed May 19, 2013.