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1Foilsithe / Cruthaithe 1987“...Sage Publications,...”
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2Foilsithe / Cruthaithe 2007“...Sage Publications,...”
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3Foilsithe / Cruthaithe 1986“...Sage Publications,...”
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4Foilsithe / Cruthaithe 1973“...R. Sage Foundation,...”
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5Foilsithe / Cruthaithe 2011“...Russell Sage Foundation,...”
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6de réir Schumacher, Donald“...Corwin Press, a Sage Pub. Co. : National Association of Elementary School Principals,...”
Foilsithe / Cruthaithe 2007
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