Ary, Donald
Introduction to research in education
Wardsword Cengage Learning, 2010
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Wiersma, William
Research methods in education : an introduction
Pearson, 2009
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Rummel, J. Francis
An Introduction to research procedures in education / J. Francis Rummel
Harper & Row, 1964
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Wiersma, William
Research methods in education: an introduction / William Wiersma
Allyn and Bacon , 1991
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Best, John W.
Research in education
Pearson, 2014
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