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Cognitive interviewing : a tool for improving questionnaire design.
Gordon B. Willis Àú/±è½Å¹Ì, ±è±â¼÷, Àº¿µ, È«¼±¿ì, ±èÁø½Ç ¿ªIÁ¤´ã¹Ìµð¾îI2013.10.31
20,000¿ø
600P (3%)