TY - JFULL ID - 134209150 TI - Principal leadership. PY - 2000 PB - Reston, Va. : National Association of Secondary School Principals, DB - UniCat KW - Middle school principals KW - Middle school administrators KW - Middle schools KW - Directeurs d'école moyenne KW - Écoles moyennes KW - Middle school administrators. KW - Middle school principals. KW - Middle schools. KW - Administration KW - United States. KW - United States UR - https://www.unicat.be/uniCat?func=search&query=sysid:134209150 AB - ER -