Lee, R. M. (2000). Unobtrusive methods in social research. Open University Press.
Cita Chicago Style (17a ed.)Lee, Raymond M. Unobtrusive Methods in Social Research. Buckingham [England]: Open University Press, 2000.
Cita MLA (9a ed.)Lee, Raymond M. Unobtrusive Methods in Social Research. Open University Press, 2000.
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