Foundations for research: methods of inquiry in education and the social sciences
New jersey, 2004
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Dunn, Dana S.
Research methods for social psychology
Wiley-Blackwell, 2009
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Sjoberg, Gideon
A methodology for social research
Harper & Row Publishers, 1968
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Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
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Doing social psychology research
BPS Blackwell, 2004
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