Lansing, J. B., & Morgan, J. N. (1971). Economic survey methods. Survey Research Center, University of Michigan].
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Chicago-čujuhus (17. p.)
Lansing, John B., juo James N. Morgan. Economic Survey Methods. [Ann Arbor: Survey Research Center, University of Michigan], 1971.
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MLA-čujuhus (9. p.)
Lansing, John B., juo James N. Morgan. Economic Survey Methods. Survey Research Center, University of Michigan], 1971.
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