1. 39.US Centers for Disease Control and Prevention: Questions and answers about plague. Available at http://www.cdc.gov/ncidod/dvbid/plague/qa.htm. Accessed 03 December 2009.
2. 51. Burkle FM Jr : The grand experiment: International health regulations, pandemics, and future emergencies of scarcity. Presented at the US-CHINA Symposium on Comparative Governance, 14-16 October 2009 co-sponsored by the Kissinger Institute on China and the United States, Woodrow Wilson International Center for Scholars, Washington DC, and the Counselor's Office, State Council, People's Republic of China. pp 1–7.
3. 32. Onyango E : Unplanned settlements, a growing phenomenon in most towns and cities. Knowledge Matters: Tanzania. Posted 23 January 2010.
4. 42. Evans A : Managing scarcity: The institutional dimensions. Available at http://www.globalpolicy.org/security-council/dark-side-of-naturalresources/other-articles-analysis-and-general-debate/48191.html. Accessed 21 September 2009.