Wiersma, William
Research methods in education: an introduction / William Wiersma
Allyn and Bacon , 1991
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Wiersma, William, author
Research methods in education: an introduction
Pearson/Allyn and Bacon, 2005
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Ary, Donald
Introduction to research in education
Wardsword Cengage Learning, 2010
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Borg, Walter R.
Educational research: an introduction / Walter R. Borg
David Mc Kay Co., 1963
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Rummel, J. Francis
An Introduction to research procedures in education / J. Francis Rummel
Harper & Row, 1964
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