Lepkowski, J. M. (1988). Telephone sampling methods in the United States. In R. M. Groves, P. P. Biemer, L. E. Lyberg, J. T. Massey, W. L. Nicholls II & J. Waksberg (Eds.), Telephone Survey Methodology (pp. 73-98). New York: Wiley.
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Lepkowski; J. M., 1988: Telephone Sampling Methods in the United States. In: R.M. Groves et al. (Hrsg.), Telephone Survey Methodology. John Wiley.
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