Nixon announces new doctrine. (2013). The History Channel website. Retrieved 1:24, May 25, 2013, from http://www.history.com/this-day-in-history/nixon-announces-new-doctrine.
Nixon announces new doctrine. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/nixon-announces-new-doctrine [Accessed 25 May 2013].
“Nixon announces new doctrine.” 2013. The History Channel website. May 25 2013, 1:24 http://www.history.com/this-day-in-history/nixon-announces-new-doctrine.
“Nixon announces new doctrine,” The History Channel website, 2013, http://www.history.com/this-day-in-history/nixon-announces-new-doctrine [accessed May 25, 2013].
“Nixon announces new doctrine,” The History Channel website, http://www.history.com/this-day-in-history/nixon-announces-new-doctrine (accessed May 25, 2013).
Nixon announces new doctrine [Internet]. The History Channel website; 2013 [cited 2013 May 25] Available from: http://www.history.com/this-day-in-history/nixon-announces-new-doctrine.
Nixon announces new doctrine, http://www.history.com/this-day-in-history/nixon-announces-new-doctrine (last visited May 25, 2013).
Nixon announces new doctrine. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/nixon-announces-new-doctrine. Accessed May 25, 2013.