“People Like Us: Social Class in America”: website of the PBS documentary.
http://www.pbs.org/peoplelikeus/

The social inequality resource page from the Trinity University website, “A Sociological Tour Through Cyberspace.”
http://www.trinity.edu/mkearl/strat.html

“Who is Poor?” from the Institute for Research on Poverty.
http://www.ssc.wisc.edu/irp/faqs/faq3.htm

The official website of Barbara Ehrenreich’s Nickel and Dimed.
http://www.nickelanddimed.net/