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Schaefer, W. (1976a, June 15). At least sixty percent of promotion material is wasted!. ANA - ESOMAR. Retrieved September 23, 2024, from
https://ana.esomar.org/documents/at-least-sixty-percent-of-promotion-material-is-wasted-
Schaefer, W. (1965a, June 15). Should advertisements be "believable" or "convincing"?. ANA - ESOMAR. Retrieved September 23, 2024, from
https://ana.esomar.org/documents/should-advertisements-be-believable-or-convincing-
Schaefer, W. (1961a, June 15). Advertising research utopia 1961? (German). ANA - ESOMAR. Retrieved September 23, 2024, from
https://ana.esomar.org/documents/advertising-research-utopia-1961-german-
Schaefer, W. (1961a, June 15). Advertising research utopia 1961?. ANA - ESOMAR. Retrieved September 23, 2024, from
https://ana.esomar.org/documents/advertising-research-utopia-1961-