Journal Article Mixed-Mode Contacts In Web Surveys: Paper is Not Necessarily Better Get access Stephen R. Porter, Stephen R. Porter e-mail:Address correspondence to Stephen R. Porter; e-mail: srporter@iastate.edu Search for other works by this author on: Oxford Academic Google Scholar Michael E. Whitcomb Michael E. Whitcomb Search for other works by this author on: Oxford Academic Google Scholar Public Opinion Quarterly, Volume 71, Issue 4, Winter 2007, Pages 635–648, https://doi.org/10.1093/poq/nfm038 Published: 01 January 2007
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Porter et al. (2007) studied this question.