Superpowers to destroy chemical weapons. (2013). The History Channel website. Retrieved 3:17, May 24, 2013, from http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons.
Superpowers to destroy chemical weapons. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons [Accessed 24 May 2013].
“Superpowers to destroy chemical weapons.” 2013. The History Channel website. May 24 2013, 3:17 http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons.
“Superpowers to destroy chemical weapons,” The History Channel website, 2013, http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons [accessed May 24, 2013].
“Superpowers to destroy chemical weapons,” The History Channel website, http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons (accessed May 24, 2013).
Superpowers to destroy chemical weapons [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons.
Superpowers to destroy chemical weapons, http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons (last visited May 24, 2013).
Superpowers to destroy chemical weapons. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/superpowers-to-destroy-chemical-weapons. Accessed May 24, 2013.