Michigan. University. Survey Research Center. (1971). Working papers on survey research in poverty areas. s.n.
Chicago-viite (17. p.)Michigan. University. Survey Research Center. Working Papers on Survey Research in Poverty Areas. Ann Arbor: s.n, 1971.
MLA-viite (9. p.)Michigan. University. Survey Research Center. Working Papers on Survey Research in Poverty Areas. s.n, 1971.
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