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1
How to design and evaluate research in education / Jack R. Fraenkel, Norman E. Wallen, Helen H. Hyun.
New York : McGraw-Hill Higher Education, 2011
xxviii, 642 p. : ill. ; 27 cm.
2
How to design and evaluate research in education / Jack R. Fraenkel, Norman E. Wallen, Helen H. Hyun.
New York : McGraw-Hill Higher Education, 2008
xxviii, 707 p. : ill. ; 27 cm.