Trewin, D., & Lee, G. (1988). International Comparisons of Telephone coverage. In R. M.
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Trewin, D./Lee, G., 1988: International Comparison of Telephone Coverage. S. 9-24 in: R. Groves et al., (Hrsg.), Telephone Survey Methodology. New York: John Wiley & Sons.
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Trewin, D., Lee, G. (1988). International Comparisons of Telephone coverage. New York: John Wiley & Sons. Telephone Survey Methodology, pp. 9-24.
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