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Schmidtchen, G. (1980a, June 15). National value systems. ANA - ESOMAR. Retrieved June 08, 2024, from
https://ana.esomar.org/documents/national-value-systems
Schmidtchen, G. (1962a, June 15). Representative quota sampling. ANA - ESOMAR. Retrieved June 08, 2024, from
https://ana.esomar.org/documents/representative-quota-sampling
Schmidtchen, G. (1962a, June 15). Representative quota sampling . ANA - ESOMAR. Retrieved June 08, 2024, from
https://ana.esomar.org/documents/representative-quota-sampling-
Schmidtchen, G. (1959a, June 15). Measuring the effects of mass-communication. ANA - ESOMAR. Retrieved June 08, 2024, from
https://ana.esomar.org/documents/measuring-the-effects-of-mass-communication