Sharma, D. (1999). marketing research, principles, Applications and cases (2nd.). Sultan Chand & Sons.
Lua i Stíl Chicago (17ú heag.)Sharma, D. Marketing Research, Principles, Applications and Cases. 2nd. New Delhi: Sultan Chand & Sons, 1999.
Lua MLA (9ú heag.)Sharma, D. Marketing Research, Principles, Applications and Cases. 2nd. Sultan Chand & Sons, 1999.
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