East Germany approves new constitution. (2013). The History Channel website. Retrieved 12:31, May 22, 2013, from http://www.history.com/this-day-in-history/east-germany-approves-new-constitution.
East Germany approves new constitution. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/east-germany-approves-new-constitution [Accessed 22 May 2013].
“East Germany approves new constitution.” 2013. The History Channel website. May 22 2013, 12:31 http://www.history.com/this-day-in-history/east-germany-approves-new-constitution.
“East Germany approves new constitution,” The History Channel website, 2013, http://www.history.com/this-day-in-history/east-germany-approves-new-constitution [accessed May 22, 2013].
“East Germany approves new constitution,” The History Channel website, http://www.history.com/this-day-in-history/east-germany-approves-new-constitution (accessed May 22, 2013).
East Germany approves new constitution [Internet]. The History Channel website; 2013 [cited 2013 May 22] Available from: http://www.history.com/this-day-in-history/east-germany-approves-new-constitution.
East Germany approves new constitution, http://www.history.com/this-day-in-history/east-germany-approves-new-constitution (last visited May 22, 2013).
East Germany approves new constitution. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/east-germany-approves-new-constitution. Accessed May 22, 2013.