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Survey Incentives: Cash vs. In-Kind; Face-to-Face vs. Mail; Response Rate vs. Nonresponse Error
Marans, Robert W
; Ryu, E. (2006).
Survey Incentives: Cash vs. In-Kind; Face-to-Face vs. Mail; Response Rate vs. Nonresponse Error
. International Journal of Public Opinion Research. 18(1), 89-106.