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B.V. and B.V. (2015a, June 15). ESOMAR/GRBN guideline for online sample quality . ANA - ESOMAR. Retrieved June 28, 2024, from
https://ana.esomar.org/documents/esomar-grbn-guideline-for-online-sample-quality-
B.V., E. (2015a, June 15). ESOMAR data protection checklist. ANA - ESOMAR. Retrieved June 28, 2024, from
https://ana.esomar.org/documents/esomar-data-protection-checklist-8432
B.V., E. (2015a, June 15). ESOMAR data protection checklist (Spanish). ANA - ESOMAR. Retrieved June 28, 2024, from
https://ana.esomar.org/documents/esomar-data-protection-checklist-spanish--8435
B.V. and B.V. (2015a, June 15). ESOMAR/GRBN guideline for online sample quality (German). ANA - ESOMAR. Retrieved June 28, 2024, from
https://ana.esomar.org/documents/esomar-grbn-guideline-for-online-sample-quality-german-
B.V., E. (2015a, June 15). Mystery shopping studies (Spanish). ANA - ESOMAR. Retrieved June 28, 2024, from
https://ana.esomar.org/documents/mystery-shopping-studies-spanish-
B.V. and B.V. (2014a, August 15). ESOMAR/WAPOR guideline on opinion polls and published surveys (Japanese). ANA - ESOMAR. Retrieved June 28, 2024, from
B.V. and B.V. (2014a, August 15). ESOMAR/WAPOR guideline on opinion polls and published surveys . ANA - ESOMAR. Retrieved June 28, 2024, from
https://ana.esomar.org/documents/esomar-wapor-guideline-on-opinion-polls-and-published-surveys-
B.V. and B.V. (2014a, August 15). ESOMAR/WAPOR guideline on opinion polls and published surveys (French). ANA - ESOMAR. Retrieved June 28, 2024, from
B.V. and B.V. (2014a, August 15). ESOMAR/WAPOR guideline on opinion polls and published surveys (German). ANA - ESOMAR. Retrieved June 28, 2024, from