Singer, E., van Hoewyk, J., & Maher, M. (1998). Does the payment of incentives create expectation effects? Public Opinion Quarterly, 62, 152-164. https://doi. org/10.1086/297838.
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Singer, E., Hoewyk, J., Maher, M. (1998). Does the payment of incentives create expectation effects?. Public Opinion Quarterly, 62 pp. 152-164.
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