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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Crano, William D.
Principles and methods of social research
Lawrence Erlbaum Assossiate, 2002
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Goode, William J.
Methods in social research
McGraw-Hill, 1952
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