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
Allyn and Bacon , 1991
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Wiersma, William
Research methods in education : an introduction
Pearson, 2009
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Dunn, Dana S.
Research methods for social psychology
Wiley-Blackwell, 2009
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Crano, William D.
Principles and methods of social research
Lawrence Erlbaum Assossiate, 2002
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