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RT @UM_SRC: Singer's chapters: The Use and Effects of Incentives in Surveys (https://t.co/KtKzZ0AgUt) & Survey Incentives (https://t.co/iXV…
RT @UM_SRC: Singer's chapters: The Use and Effects of Incentives in Surveys (https://t.co/KtKzZ0AgUt) & Survey Incentives (https://t.co/iXV…
Singer's chapters: The Use and Effects of Incentives in Surveys (https://t.co/KtKzZ0AgUt) & Survey Incentives (https://t.co/iXVSFTVCEu)