Vockell, Edward L.
Educational research / Edward L. Vockell
Macmillan, 1983
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Borg, Walter R.
Educational research: an introduction / Walter R. Borg
David Mc Kay Co., 1963
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McAshan, H. H. (Hildreth Hoke)
Elements of educational research / H. H. McAshan
McGraw-Hill, 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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Frindland, L
Paths of science
Foreign Languages Publishing House, 1956
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