U-2 Spy Plane Incident:
Kelly, Martin. "Still Mysterious: Gary Powers and the Spy Plane Incident." About.com American History. About.com, 2014. Web. 06 June 2014.
"1960 U-2 Incident." Wikipedia. Wikimedia Foundation, 06 May 2014. Web. 05 June 2014.
"Lockheed U-2." Wikipedia. Wikimedia Foundation, 06 June 2014. Web. 07 June 2014.
Berlin Wall/ Berlin Airlift:
Rosenburg, Jennifer. "All About the Rise and Fall of the Berlin Wall." About.com 20th Century History. About.com, 2014. Web. 07 June 2014.
Halvorsen, Gail S., Roger G. Miller, Roger D. Launius, and William H. Tunner. "The Berlin Airlift." The Berlin Airlift. N.p., n.d. Web. 07 June 2014.
Cuban Missile Crisis:
"The Cuban Missile Crisis, October 1962." The Cuban Missile Crisis, October 1962 - 1961–1968 - Milestones - Office of the Historian. N.p., n.d. Web. 07 June 2014.
Kelly, Martin. "Still Mysterious: Gary Powers and the Spy Plane Incident." About.com American History. About.com, 2014. Web. 06 June 2014.
"1960 U-2 Incident." Wikipedia. Wikimedia Foundation, 06 May 2014. Web. 05 June 2014.
"Lockheed U-2." Wikipedia. Wikimedia Foundation, 06 June 2014. Web. 07 June 2014.
Berlin Wall/ Berlin Airlift:
Rosenburg, Jennifer. "All About the Rise and Fall of the Berlin Wall." About.com 20th Century History. About.com, 2014. Web. 07 June 2014.
Halvorsen, Gail S., Roger G. Miller, Roger D. Launius, and William H. Tunner. "The Berlin Airlift." The Berlin Airlift. N.p., n.d. Web. 07 June 2014.
Cuban Missile Crisis:
"The Cuban Missile Crisis, October 1962." The Cuban Missile Crisis, October 1962 - 1961–1968 - Milestones - Office of the Historian. N.p., n.d. Web. 07 June 2014.