Reagan challenges Gorbachev to tear down the Berlin Wall. (2013). The History Channel website. Retrieved 10:02, May 20, 2013, from http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall.
Reagan challenges Gorbachev to tear down the Berlin Wall. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall [Accessed 20 May 2013].
“Reagan challenges Gorbachev to tear down the Berlin Wall.” 2013. The History Channel website. May 20 2013, 10:02 http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall.
“Reagan challenges Gorbachev to tear down the Berlin Wall,” The History Channel website, 2013, http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall [accessed May 20, 2013].
“Reagan challenges Gorbachev to tear down the Berlin Wall,” The History Channel website, http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall (accessed May 20, 2013).
Reagan challenges Gorbachev to tear down the Berlin Wall [Internet]. The History Channel website; 2013 [cited 2013 May 20] Available from: http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall.
Reagan challenges Gorbachev to tear down the Berlin Wall, http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall (last visited May 20, 2013).
Reagan challenges Gorbachev to tear down the Berlin Wall. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/reagan-challenges-gorbachev-to-tear-down-the-berlin-wall. Accessed May 20, 2013.