1. Howsocial processes distort measurement: the impact of survey nonresponse on estimates of volunteer work in the United States;Abraham;American Journal of Sociology,2009
2. Nonresponse in the American Time Use Survey: who is missing from the data and how much does it matter?;Abraham;Public Opinion Quarterly,2006
3. American Association for Public Opinion Research (AAPOR) 2005 AAPOR Code of Professional Ethics & Practice http://www.aapor.org/aaporcodeofethics