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              Kna ¨uper, Ba ¨rbel, Robert Belli, Daniel Hill, and Regula Herzog. 1997. "Question Difficulty and Respondent Cognitive Ability: The Impact on Data Quality." Jour- nal of Official Statistics 13(2):181-99.
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              Knauper, B., Belli, R. B., Hill, D. H., & Herzog, A. R. (1997). Question difficulty and respondents' cognitive ability: The impact on data quality. Journal of Official Statistics, 13(2), 181-199. https://www.psc.isr.umich.edu/pubs/abs/1046
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              Knäuper, B., Belli, R. F., Hill, D. H., & Herzog, A. R. (1997). Question difficulty and respondents' cognitive ability: The effect on data quality. Journal Of Official Statistics, 13(2), 181-199.
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              Knäuper, B., Belli, R. F., Hill, D. H., & Herzog, R. A. (1997). Question Difficulty and Respondents' Cognitive Ability: The Effect on Data Quality. Journal of Official Statistics, 13(2), 181-199.
                 (xsd:string)
              
            
 
            - 
              Knäuper, B., R. F. Belli, D. H. Hill, and A. R. Herzog (1997). 'Question Difficulty and Respondents' Cognitive ability: The effect on data quality' . In: Journal of Official Statistics 13.1, pp. 181-199.
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            - 
              Knäuper, B., R. F. Belli, D. H. Hill, and A. R. Herzog. 1997. "Question difficulty and respondents' cognitive ability: The effect on data quality." Journal of Official Statis- tics 13:181-199.
                 (xsd:string)
              
            
 
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              Knäuper, B./Belli, R. Hill, D./Herzog, R., 1997: Question difficulty and respondent's cognitive ability: the effect on data quality. In: Journal of Official Statistics, 13, 181-199.
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              Knäuper, B., Belli, R. F., Hill, D. H., Herzog, A. R. (1997). 'Question Difficulty and Respondents' Cognitive ability: The effect on data quality'. Jour- nal of Official Statistics, 13(2), pp. 181-199.
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