Groves, R.M./Cialdini, R.B./Couper, M.P., 1992: Understanding the Decision to Partici- pate in a Survey. Public Opinion Quarterly, 56: 475-495.
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Groves, R. M. C., R.B./Couper, M. P. (1992). Understanding the Decision to Partici- pate in a Survey. Public Opinion Quarterly, 56 pp. 475-495.
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