Colleting and interpreting qualitative materials
edited by Norman K. Denzin, Yvonna S. Lincoln
Sage, 1998
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Marshall, Catherine
Designing qualitative research
Sage, 1999
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Berg, Bruce Lawrence, 1954-
Qualitative reseach methods for the social sciences
Allyn and Bacon, 1989
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Berg, Bruce Lawrence, 1954-
Qualitative research methods for the social sciences
Pearson, 2014
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Tashakkori, Abbas
Mixed methodology : combining qualitative and quantitative approaches
Sage, 1998
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