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Sources:

  • Buettner, Dan. "Report from the 'Blue Zone': Why Do People Live Long in Costa Rica?" ABC News. Feb. 2, 2007. (June 25, 2008) http://abcnews.go.com/Technology/LivingLonger/story?id=2843049&page=1
  • Buettner, Dan. "The Blue Zones: Lessons for Living Longer From the People Who've Lived the Longest." Washington, D.C.: National Geographic, 2008.