Olson, K.; Lepkowski, J. M.; Garabrant, D. H. An Experimental Examination of the Content of Persuasion Letters on Nonresponse Rates and Survey Estimates in a Nonresponse Follow-Up Study. SRM 2011, 5 (1), 21-26. https://doi.org/10.18148/srm/2011.v5i1.4324.