Wiersma, William
Research methods in education: an introduction
Pearson/Allyn and Bacon, 2005
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Wiersma, William
Research methods in education : an introduction
Pearson, 2009
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Methods of research in social psychology
Elliot Aronson...[et al.]
McGraw-Hill , 1990
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Bank, Marcus
Visual methods in social research
Sage Publications, 2001
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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