Berlin Wall opened for first time. (2013). The History Channel website. Retrieved 2:02, June 19, 2013, from http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time.
Berlin Wall opened for first time. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time [Accessed 19 Jun 2013].
“Berlin Wall opened for first time.” 2013. The History Channel website. Jun 19 2013, 2:02 http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time.
“Berlin Wall opened for first time,” The History Channel website, 2013, http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time [accessed Jun 19, 2013].
“Berlin Wall opened for first time,” The History Channel website, http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time (accessed Jun 19, 2013).
Berlin Wall opened for first time [Internet]. The History Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time.
Berlin Wall opened for first time, http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time (last visited Jun 19, 2013).
Berlin Wall opened for first time. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/berlin-wall-opened-for-first-time. Accessed Jun 19, 2013.