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Sherak, B. (1966a, September 01). Testing new product ideas. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/testing-new-product-ideas
King, S. (1966a, August 01). How useful is proposition testing?. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/how-useful-is-proposition-testing-