Ultee, Wout. "Life Chances and Resources." Blackwell Encyclopedia of Sociology. Ritzer, George (ed). Blackwell Publishing, 2007. Blackwell Reference Online. 15 November 2013 [3]
books.google.com
Kevin Fitzpatrick, Mark La Gory, Unhealthy places: the ecology of risk in the urban landscape, Psychology Press, 2000, ISBN0-415-92372-7, Google Print, p.90-91
William C. Cockerham Health and social change in Russia and Eastern Europe, Routledge, 1999, ISBN0-415-92081-7, [1]