Koschnick, W. J. (1996). Dictionary of social and market research. Gower.
Lua i Stíl Chicago (17ú heag.)Koschnick, Wolfgang J. Dictionary of Social and Market Research. Hampshire, England ; Brookfield, VT: Gower, 1996.
Lua MLA (8ú heag.)Koschnick, Wolfgang J. Dictionary of Social and Market Research. Gower, 1996.
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