Colleting and interpreting qualitative materials
edited by Norman K. Denzin, Yvonna S. Lincoln
Sage, 1998
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Williams, Malcolm, 1953-
Making sense of social research
Sage , 2003
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Babbie, Earl R.
The practice of social research
Wadsworth, 2010
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Babbie, Earl R.
The practice of social research
Thomson/Wadsworth, 2004
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Babbie, Earl R.
The practice of social research
Wadsworth, 1975
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