Margaret Redsteer (U.S. Geological Survey),Harris Francis (Harris Francis),Debra Block (U.S. Geological Survey),Klara B. Kelley (Klara B. Kelley) 2011: Disaster Risk Assessment Case Study: Recent Drought on the Navajo Nation, Southwestern United States. Contributing Paper for the Global Assessment Report on Disaster Risk Reduction, <http://www.preventionweb.net/english/hyogo/gar/2011/en/bgdocs/Redsteer_Kelley_Francis_&_Block_2010.pdf>