Bechhofer, Frank
Principles of research design in the social sciences
Routledge, 2000
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Marshall, Catherine
Designing qualitative research
Sage, 1999
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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Methodology of social science research
edited by Sugata Dasgupta
Impex India, 1967
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Babbie, Earl R.
Social research counts
Wadsworth and Cengage Learning, 2013 (International edition)
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