1. Subject acquisition for web-based surveys: Political analysis;Alvarez;Political Analysis,2003
2. American Association for Public Opinion Research. (2000). Standard definitions: Final dispositions of case codes and outcome rates for surveys. Sponsored by AAPOR.
3. Monetary incentives in mail surveys;Armstrong;Public Opinion Quarterly,1975
4. Bauman, S., Jobity, N., Airey, J., & Atak, H. (2000). Invites, intros and incentives: Lessons from a web survey. In Proceedings of the Annual Conference of American Association for Public Opinion Research.
5. The effects of cash, electronic, and paper gift certificates as respondent incentives for a web-based survey of technologically sophisticated respondents;Birnholtz;Social Science Computer Review,2004