Record-breaking tornado wave begins. (2013). The History Channel website. Retrieved 7:11, May 25, 2013, from http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins.
Record-breaking tornado wave begins. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins [Accessed 25 May 2013].
“Record-breaking tornado wave begins.” 2013. The History Channel website. May 25 2013, 7:11 http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins.
“Record-breaking tornado wave begins,” The History Channel website, 2013, http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins [accessed May 25, 2013].
“Record-breaking tornado wave begins,” The History Channel website, http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins (accessed May 25, 2013).
Record-breaking tornado wave begins [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins.
Record-breaking tornado wave begins, http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins (last visited May 25, 2013).
Record-breaking tornado wave begins. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/record-breaking-tornado-wave-begins. Accessed May 25, 2013.