Shipler, D. K. (2004). The working poor: Invisible in America. New York: Vintage Books.
Lua i Stíl Chicago (17ú heag.)Shipler, David K. The Working Poor: Invisible in America. New York: Vintage Books, 2004.
Lua MLA (8ú heag.)Shipler, David K. The Working Poor: Invisible in America. New York: Vintage Books, 2004.
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