Goode, William J.
Methods in social research
McGraw-Hill, 1952
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Berg, Bruce Lawrence, 1954-
Qualitative research methods for the social sciences
Pearson, 2004
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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Galtung, Johan
Theory and methods of social research/ Johan Galtung
George Allen and Unwin, 1969
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Black, James A.
Methods and issues in social research
John Wiley & Sons, 1976
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