National Association of Secondary School Principals (U.S.). (2006). Principal's research review. National Association of Secondary School Principals.
Chicago-Zitierstil (17. Ausg.)National Association of Secondary School Principals (U.S.). Principal's Research Review. Reston, VA: National Association of Secondary School Principals, 2006.
MLA-Zitierstil (9. Ausg.)National Association of Secondary School Principals (U.S.). Principal's Research Review. National Association of Secondary School Principals, 2006.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.