George Goodfellow investigates earthquake. (2013). The History Channel website. Retrieved 9:53, June 18, 2013, from http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake.
George Goodfellow investigates earthquake. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake [Accessed 18 Jun 2013].
“George Goodfellow investigates earthquake.” 2013. The History Channel website. Jun 18 2013, 9:53 http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake.
“George Goodfellow investigates earthquake,” The History Channel website, 2013, http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake [accessed Jun 18, 2013].
“George Goodfellow investigates earthquake,” The History Channel website, http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake (accessed Jun 18, 2013).
George Goodfellow investigates earthquake [Internet]. The History Channel website; 2013 [cited 2013 Jun 18] Available from: http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake.
George Goodfellow investigates earthquake, http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake (last visited Jun 18, 2013).
George Goodfellow investigates earthquake. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/george-goodfellow-investigates-earthquake. Accessed Jun 18, 2013.