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Berekoven, L. (1971a, June 15). The validity and reliability of the results of standardised interviews. ANA - ESOMAR. Retrieved June 14, 2024, from
Brandsma, P. (1969a, August 01). The role and influence of the interviewer. ANA - ESOMAR. Retrieved June 14, 2024, from
https://ana.esomar.org/documents/the-role-and-influence-of-the-interviewer
Karlsson, H. K. (1968a, June 15). Postal contact. ANA - ESOMAR. Retrieved June 14, 2024, from
https://ana.esomar.org/documents/postal-contact
Besmer, H. (1966a, August 01). Test marketing renewed in the test . ANA - ESOMAR. Retrieved June 14, 2024, from
https://ana.esomar.org/documents/test-marketing-renewed-in-the-test-
Neffe, Girardi and Steiner (1966a, August 01). Measuring and measurables in purchasing decisions. ANA - ESOMAR. Retrieved June 14, 2024, from
https://ana.esomar.org/documents/measuring-and-measurables-in-purchasing-decisions
Webster, L. (1965a, June 15). Comparability in multi-country surveys. ANA - ESOMAR. Retrieved June 14, 2024, from
https://ana.esomar.org/documents/comparability-in-multi-country-surveys