Moser, C. A., & Kalton, G. (1971). Survey methods in social investigation (2nd ed.). Heinemann Educational ; Ashgate.
Lua i Stíl Chicago (17ú heag.)Moser, Claus Adolf, agus Graham Kalton. Survey Methods in Social Investigation. 2nd ed. London: Heinemann Educational ; Ashgate, 1971.
Lua MLA (8ú heag.)Moser, Claus Adolf, agus Graham Kalton. Survey Methods in Social Investigation. 2nd ed. Heinemann Educational ; Ashgate, 1971.
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