East Germany begins construction of the Berlin Wall. (2013). The History Channel website. Retrieved 2:21, June 20, 2013, from http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall.
East Germany begins construction of the Berlin Wall. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall [Accessed 20 Jun 2013].
“East Germany begins construction of the Berlin Wall.” 2013. The History Channel website. Jun 20 2013, 2:21 http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall.
“East Germany begins construction of the Berlin Wall,” The History Channel website, 2013, http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall [accessed Jun 20, 2013].
“East Germany begins construction of the Berlin Wall,” The History Channel website, http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall (accessed Jun 20, 2013).
East Germany begins construction of the Berlin Wall [Internet]. The History Channel website; 2013 [cited 2013 Jun 20] Available from: http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall.
East Germany begins construction of the Berlin Wall, http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall (last visited Jun 20, 2013).
East Germany begins construction of the Berlin Wall. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/east-germany-begins-construction-of-the-berlin-wall. Accessed Jun 20, 2013.