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Cita Chicago (17th ed.)Survey of Income and Program Participation (SIPP) 1993 Panel United States Department of Commerce. Bureau of the Census. [electronic Resource]. 1997.
Cita MLA (9th ed.)Survey of Income and Program Participation (SIPP) 1993 Panel United States Department of Commerce. Bureau of the Census. [electronic Resource]. 1997.
Atenció: Aquestes cites poden no estar 100% correctes.