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2. American Association for Public Opinion Research 2010 Cell phone task force report: New considerations for survey researchers when planning and conducting RDD telephone surveys in the U.S. with respondents reached via cell phone numbers http://www.aapor.org/Education-Resources/Reports/Cell-Phone-Task-Force-Report.aspx
3. Incentives, motives, and response bias;Cannell;Annals of Economic and Social Measurement,1974
4. Stratified telephone survey designs;Casady;Survey Methodology,1993