Tokyo subways are attacked with sarin gas. (2013). The History Channel website. Retrieved 3:21, May 20, 2013, from http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas.
Tokyo subways are attacked with sarin gas. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas [Accessed 20 May 2013].
“Tokyo subways are attacked with sarin gas.” 2013. The History Channel website. May 20 2013, 3:21 http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas.
“Tokyo subways are attacked with sarin gas,” The History Channel website, 2013, http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas [accessed May 20, 2013].
“Tokyo subways are attacked with sarin gas,” The History Channel website, http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas (accessed May 20, 2013).
Tokyo subways are attacked with sarin gas [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas.
Tokyo subways are attacked with sarin gas, http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas (last visited May 20, 2013).
Tokyo subways are attacked with sarin gas. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/tokyo-subways-are-attacked-with-sarin-gas. Accessed May 20, 2013.