Não informado. (1932). National Elementary Principal. National Association of Elementary School Principals.
Chicago-Zitierstil (17. Ausg.)Não informado. National Elementary Principal. Arlington, Va: National Association of Elementary School Principals, 1932.
MLA-Zitierstil (8. Ausg.)Não informado. National Elementary Principal. National Association of Elementary School Principals, 1932.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.