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  1. 1
    由 Platek, R. (Richard)
    出版 1985
    “...HN 29 .P716...”
    Government Document 图书
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    Development and design of survey questionnaires /
  2. 2
    出版 1975
    “...HA 31.2 .S963...”
    Government Document 杂志
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    Survey methodology.

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