Krakatoa erupts. (2013). The History Channel website. Retrieved 2:41, May 19, 2013, from http://www.history.com/this-day-in-history/krakatoa-erupts.
Krakatoa erupts. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/krakatoa-erupts [Accessed 19 May 2013].
“Krakatoa erupts.” 2013. The History Channel website. May 19 2013, 2:41 http://www.history.com/this-day-in-history/krakatoa-erupts.
“Krakatoa erupts,” The History Channel website, 2013, http://www.history.com/this-day-in-history/krakatoa-erupts [accessed May 19, 2013].
“Krakatoa erupts,” The History Channel website, http://www.history.com/this-day-in-history/krakatoa-erupts (accessed May 19, 2013).
Krakatoa erupts [Internet]. The History Channel website; 2013 [cited 2013 May 19] Available from: http://www.history.com/this-day-in-history/krakatoa-erupts.
Krakatoa erupts, http://www.history.com/this-day-in-history/krakatoa-erupts (last visited May 19, 2013).
Krakatoa erupts. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/krakatoa-erupts. Accessed May 19, 2013.