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Sondervan and Schalekamp (1991a, June 15). Mystery shopper research. ANA - ESOMAR. Retrieved December 07, 2023, from
https://ana.esomar.org/documents/mystery-shopper-research
Sondervan and Schalekamp (1988a, May 04). Business travel monitor. ANA - ESOMAR. Retrieved December 07, 2023, from
https://ana.esomar.org/documents/business-travel-monitor