(2006). Survey of Consumer Attitudes and Behavior, October 1997 University of Michigan. Survey Research Center.Economic Behavior Program. [electronic resource].
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Survey of Consumer Attitudes and Behavior, October 1997 University of Michigan. Survey Research Center.Economic Behavior Program. [electronic Resource]. 2006.
MLA -ийн эшлэл (9 дэх хэвлэлт)Survey of Consumer Attitudes and Behavior, October 1997 University of Michigan. Survey Research Center.Economic Behavior Program. [electronic Resource]. 2006.
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