National Association of Secondary School Principals (U.S.). (2000). Principal leadership (Middle level ed.). National Association of Secondary School Principals.
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Cita Chicago Style (17a ed.)
National Association of Secondary School Principals (U.S.). Principal Leadership. Middle level ed. Reston, Va.: National Association of Secondary School Principals, 2000.
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Cita MLA (9a ed.)
National Association of Secondary School Principals (U.S.). Principal Leadership. Middle level ed. National Association of Secondary School Principals, 2000.
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