Bryman, Alan
Social research methods
Oxford University Press, 2016
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Johnson, John M.
Doing field research
The Free Press, 1975
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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Simon, Julian L.
Basic research methods in social sciences : the art of emperical investigation
Random House, 1978
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Stebbins, Robert A.
Exploratory research in the social sciences
Sage, 2001
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