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              Lee, R. (2000) Unobtrusive Methods In Social Research, (Understanding Social Research) Milton Keynes: Open University Press.
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              Lee, Raymond (2000). Unobtrusive methods in social research. Buckingham: Open University Press.
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              Lee, Raymond M., 2000: Unobtrusive Methods in Social Research. Buckingham: Open University Press.
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              R.M. Lee, Unobtrusive Methods in Social Research, Open Univ. Press, 2000.
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