Series of tornadoes hits Southeast U.S.. (2013). The History Channel website. Retrieved 2:41, May 21, 2013, from http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us.
Series of tornadoes hits Southeast U.S.. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us [Accessed 21 May 2013].
“Series of tornadoes hits Southeast U.S..” 2013. The History Channel website. May 21 2013, 2:41 http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us.
“Series of tornadoes hits Southeast U.S.,” The History Channel website, 2013, http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us [accessed May 21, 2013].
“Series of tornadoes hits Southeast U.S.,” The History Channel website, http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us (accessed May 21, 2013).
Series of tornadoes hits Southeast U.S. [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us.
Series of tornadoes hits Southeast U.S., http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us (last visited May 21, 2013).
Series of tornadoes hits Southeast U.S.. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/series-of-tornadoes-hits-southeast-us. Accessed May 21, 2013.