Goode, William J.
Methods in social research
McGraw-Hill, 1952
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Blalock, Hubert M.
An introduction to social research
Prentice-Hall, 1970
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Blalock, Hubert M.
An introduction to social research
Prentice-Hall, 1982
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Crano, William D.
Principles and methods of social research
Lawrence Erlbaum Assossiate, 2002
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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