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Sittenfeld, H. (1967a, June 15). Reflections on the possibilities of image research in the area of tourism . ANA - ESOMAR. Retrieved May 21, 2024, from
Sittenfeld, H. (1965a, June 15). Market research in Germany. ANA - ESOMAR. Retrieved May 21, 2024, from
https://ana.esomar.org/documents/market-research-in-germany
Sittenfeld, H. (1962a, June 15). Did we overlook something in sampling individuals?. ANA - ESOMAR. Retrieved May 21, 2024, from
https://ana.esomar.org/documents/did-we-overlook-something-in-sampling-individuals-