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1Dahkki Fraenkel, Jack R., 1932-Fáttát “...Education Research Methodology....”
Almmustuhtton 2009
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2Dahkki Fraenkel, Jack R., 1932-Fáttát “...Education Research Methodology....”
Almmustuhtton 2006
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3Dahkki Fraenkel, Jack R., 1932-Fáttát “...Education Research Methodology....”
Almmustuhtton 1996
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4Dahkki Fraenkel, Jack R., 1932-Fáttát “...Education Research Methodology....”
Almmustuhtton 2012
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5Dahkki Fraenkel, Jack R., 1932-Fáttát “...Education Research Methodology....”
Almmustuhtton 2015
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