CRIMP, M., & WRIGHT, L. T. (1995). The marketing research process.-- ed.4. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)CRIMP, Margaret, agus Len Tiu WRIGHT. The Marketing Research Process.-- Ed.4. London: Prentice Hall, 1995.
Lua MLA (9ú heag.)CRIMP, Margaret, agus Len Tiu WRIGHT. The Marketing Research Process.-- Ed.4. Prentice Hall, 1995.
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