National Association of Elementary School Principals (U.S.) & National Education Association of the United States. Department of Elementary School Principals. The National elementary principal. National Association of Elementary School Principals.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Association of Elementary School Principals (U.S.) και National Education Association of the United States. Department of Elementary School Principals. The National Elementary Principal. Arlington, Va: National Association of Elementary School Principals.
Παραπομπή σε μορφή MLA (9th εκδ.)National Association of Elementary School Principals (U.S.) και National Education Association of the United States. Department of Elementary School Principals. The National Elementary Principal. National Association of Elementary School Principals.