Crano, William D., author
Principles and methods of social research
Lawrence Erlbaum Assossiate, 2002
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Black, James A., author
Methods and issues in social research
John Wiley & Sons, 1976
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Bryman, Alan, author
Social research methods
Oxford University Press, 2016
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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Judd, Charles M., author
Research methods in social relations
Methuen, 1991
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