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Journal Article Sources of Error in Cognitive Interviews Get access Frederick G. Conrad, Frederick G. Conrad Address correspondence to Frederick Conrad; e-mail: fconrad@isr.umich.edu. Search for other works by this author on: Oxford Academic Google Scholar Johnny Blair Johnny Blair Search for other works by this author on: Oxford Academic Google Scholar Public Opinion Quarterly, Volume 73, Issue 1, Spring 2009, Pages 32–55, https://doi.org/10.1093/poq/nfp013 Published: 02 April 2009
Conrad et al. (Thu,) studied this question.