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2. Dillman, Don A. (2000), Mail and Internet Surveys: The Tailored Design Method, 2d ed., New York: John Wiley & Sons.
3. Krippendorff, Klaus (2004), Content Analysis: An Introduction to Its Methodology, Thousand Oaks, CA: Sage.
4. Luke, Douglas A. (2004), Multi-Level Modeling, Thousand Oaks, CA: Sage.
5. MacInnis, Debbie (2004), “Where Have All the Papers Gone?” ACR News (Spring), 1–3.