Groves, R. and M. Couper, 1996: Contact-Level Influences on Cooperation in Face-to-Face Surveys. Journal of Official Statistics, 12: 6-8.
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Groves, R.M. and Couper, M.P. (1996). Contact-level influences on cooperation in face-to- face surveys. Journal of Official Statistics, 12, pp. 63-83
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Groves, R., Couper, M. (1996). Contact-Level Influences on Cooperation in Face-to-Face Surveys. Journal of Official Statistics, 12 pp. 6-8.
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