AAKER, D. A., KUMAR, V., & DAY, G. S. (1995). Marketing research (Ed.5.). John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)AAKER, David A., V. KUMAR, agus George S. DAY. Marketing Research. Ed.5. New York: John Wiley and Sons, 1995.
Lua MLA (9ú heag.)AAKER, David A., et al. Marketing Research. Ed.5. John Wiley and Sons, 1995.
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