Trains collide in Pakistan. (2013). The History Channel website. Retrieved 3:31, May 20, 2013, from http://www.history.com/this-day-in-history/trains-collide-in-pakistan.
Trains collide in Pakistan. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/trains-collide-in-pakistan [Accessed 20 May 2013].
“Trains collide in Pakistan.” 2013. The History Channel website. May 20 2013, 3:31 http://www.history.com/this-day-in-history/trains-collide-in-pakistan.
“Trains collide in Pakistan,” The History Channel website, 2013, http://www.history.com/this-day-in-history/trains-collide-in-pakistan [accessed May 20, 2013].
“Trains collide in Pakistan,” The History Channel website, http://www.history.com/this-day-in-history/trains-collide-in-pakistan (accessed May 20, 2013).
Trains collide in Pakistan [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/trains-collide-in-pakistan.
Trains collide in Pakistan, http://www.history.com/this-day-in-history/trains-collide-in-pakistan (last visited May 20, 2013).
Trains collide in Pakistan. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/trains-collide-in-pakistan. Accessed May 20, 2013.