The first railroad accident. (2013). The History Channel website. Retrieved 8:36, May 23, 2013, from http://www.history.com/this-day-in-history/the-first-railroad-accident.
The first railroad accident. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/the-first-railroad-accident [Accessed 23 May 2013].
“The first railroad accident.” 2013. The History Channel website. May 23 2013, 8:36 http://www.history.com/this-day-in-history/the-first-railroad-accident.
“The first railroad accident,” The History Channel website, 2013, http://www.history.com/this-day-in-history/the-first-railroad-accident [accessed May 23, 2013].
“The first railroad accident,” The History Channel website, http://www.history.com/this-day-in-history/the-first-railroad-accident (accessed May 23, 2013).
The first railroad accident [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/this-day-in-history/the-first-railroad-accident.
The first railroad accident, http://www.history.com/this-day-in-history/the-first-railroad-accident (last visited May 23, 2013).
The first railroad accident. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/the-first-railroad-accident. Accessed May 23, 2013.