Three U.S. presidents close chapters on the Cold War. (2013). The History Channel website. Retrieved 10:48, May 23, 2013, from http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war.
Three U.S. presidents close chapters on the Cold War. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war [Accessed 23 May 2013].
“Three U.S. presidents close chapters on the Cold War.” 2013. The History Channel website. May 23 2013, 10:48 http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war.
“Three U.S. presidents close chapters on the Cold War,” The History Channel website, 2013, http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war [accessed May 23, 2013].
“Three U.S. presidents close chapters on the Cold War,” The History Channel website, http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war (accessed May 23, 2013).
Three U.S. presidents close chapters on the Cold War [Internet]. The History Channel website; 2013 [cited 2013 May 23] Available from: http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war.
Three U.S. presidents close chapters on the Cold War, http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war (last visited May 23, 2013).
Three U.S. presidents close chapters on the Cold War. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/three-us-presidents-close-chapters-on-the-cold-war. Accessed May 23, 2013.