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Vriens, Eyre, Hamilton, Tramp and Galarneau (2007a, November 12). Why do some online communities work. ANA - ESOMAR. Retrieved April 30, 2024, from
https://ana.esomar.org/documents/why-do-some-online-communities-work
Melton and Vriens (2003a, June 19). Online VS. offline administration of print audience measurement studies . ANA - ESOMAR. Retrieved April 30, 2024, from