Wiersma, William
Research methods in education : an introduction
Pearson, 2009
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Wiersma, William
Research methods in education: an introduction
Pearson/Allyn and Bacon, 2005
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Investigating communication: an introduction to research methods
Lawrence R. Frey...[et al.]
Prentice-Hall, 1991
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Zechmeister, Eugene B.
A practical introduction to research methods in psychology
McGraw-Hill, 1992
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Alston, Margaret
Research for social workers : an introduction to methods
Allen & Unwin, 1998
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