Sjoberg, Gideon
A methodology for social research
Harper & Row, 1968
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Gomm, Roger
Social research methodology : a critical introduction
Palgrave-Macmillan, 2004
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Methodology in social research
McGraw-Hill, 1971
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Weber, Max, 1864-1920
Methodology of social sciences
Transaction Publishers, 2011
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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