Worst European earthquake. (2013). The History Channel website. Retrieved 11:25, June 18, 2013, from http://www.history.com/this-day-in-history/worst-european-earthquake.
Worst European earthquake. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/worst-european-earthquake [Accessed 18 Jun 2013].
“Worst European earthquake.” 2013. The History Channel website. Jun 18 2013, 11:25 http://www.history.com/this-day-in-history/worst-european-earthquake.
“Worst European earthquake,” The History Channel website, 2013, http://www.history.com/this-day-in-history/worst-european-earthquake [accessed Jun 18, 2013].
“Worst European earthquake,” The History Channel website, http://www.history.com/this-day-in-history/worst-european-earthquake (accessed Jun 18, 2013).
Worst European earthquake [Internet]. The History Channel website; 2013 [cited 2013 Jun 18] Available from: http://www.history.com/this-day-in-history/worst-european-earthquake.
Worst European earthquake, http://www.history.com/this-day-in-history/worst-european-earthquake (last visited Jun 18, 2013).
Worst European earthquake. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/worst-european-earthquake. Accessed Jun 18, 2013.