Lofland, John
Analyzing social settings: a guide to qualitative observation and analysis
Wadsworth, 1971
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Campbell, Donald T.
Social measurement
Sage, 2001
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McNeill, Patrick
Research methods
Routledge, 1990
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Williams, Malcolm, 1953-
Science and social science: an introduction
Routledge, 2000
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Strauss, Anselm L.
Qualitative analysis for social scientists
Cambrigde University Press, 1987
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