Architect of Czechoslovakia's Prague Spring resigns. (2013). The History Channel website. Retrieved 5:49, May 20, 2013, from http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns.
Architect of Czechoslovakia's Prague Spring resigns. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns [Accessed 20 May 2013].
“Architect of Czechoslovakia's Prague Spring resigns.” 2013. The History Channel website. May 20 2013, 5:49 http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns.
“Architect of Czechoslovakia's Prague Spring resigns,” The History Channel website, 2013, http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns [accessed May 20, 2013].
“Architect of Czechoslovakia's Prague Spring resigns,” The History Channel website, http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns (accessed May 20, 2013).
Architect of Czechoslovakia's Prague Spring resigns [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns.
Architect of Czechoslovakia's Prague Spring resigns, http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns (last visited May 20, 2013).
Architect of Czechoslovakia's Prague Spring resigns. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/architect-of-czechoslovakias-prague-spring-resigns. Accessed May 20, 2013.