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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Benjafield, John G.
Thinking critical about research methods
Allyn and Bacon, 1994
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Gomm, Roger
Social research methodology : a critical introduction
Palgrave-Macmillan, 2004
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Zechmeister, Eugene B.
A practical introduction to research methods in psychology
McGraw-Hill, 1992
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