Krakatau explodes. (2013). The History Channel website. Retrieved 3:36, May 21, 2013, from http://www.history.com/this-day-in-history/krakatau-explodes.
Krakatau explodes. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/krakatau-explodes [Accessed 21 May 2013].
“Krakatau explodes.” 2013. The History Channel website. May 21 2013, 3:36 http://www.history.com/this-day-in-history/krakatau-explodes.
“Krakatau explodes,” The History Channel website, 2013, http://www.history.com/this-day-in-history/krakatau-explodes [accessed May 21, 2013].
“Krakatau explodes,” The History Channel website, http://www.history.com/this-day-in-history/krakatau-explodes (accessed May 21, 2013).
Krakatau explodes [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/krakatau-explodes.
Krakatau explodes, http://www.history.com/this-day-in-history/krakatau-explodes (last visited May 21, 2013).
Krakatau explodes. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/krakatau-explodes. Accessed May 21, 2013.