Bader, F. et al. 2016. Privacy Concerns in Responses to Sensitive Questions. A Survey Experiment on the Influence of Numeric Codes on Unit Nonresponse, Item Nonresponse, and Misreporting. methods, data, analyses. 10, 1 (Jun. 2016), 47–72. DOI:https://doi.org/10.12758/mda.2016.003.