Citations

Citations used to answer the research question of "What is the concentration of alien sightings?"

Book Source:
 Martin, Joel. The Haunting of Twentieth-Century America. 1st ed. New York: Forge, 2011.

Article Source: 
Gepper, Alexander C. T. Extraterrestrial Encounters: UFOs, Science and the Quest forTranscendence, 1947-1972. History & Technology 28, no. 3 (September 2012): 335–62.doi:10.1080/07341512.2012.723340

Internet Source: 

“UFO SIGHTINGS DAILY.” Accessed April 7, 2014. http://www.ufosightingsdaily.com/

Primary source: 

“UFO World Sightings.” Accessed April 7, 2014. http://www.ufo-world-sightings.com/Home/Home.html.