National Association of Secondary School Principals (U.S.). (1981). Schools in the middle. The Association.
Chicago-Zitierstil (17. Ausg.)National Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va.: The Association, 1981.
MLA-Zitierstil (9. Ausg.)National Association of Secondary School Principals (U.S.). Schools in the Middle. The Association, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.