Não informado. (1999). High school magazine: For principals, assistant principals, and all high school leaders. National Association of Secondary School Principals.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. High School Magazine: For Principals, Assistant Principals, and All High School Leaders. Reston, Va: National Association of Secondary School Principals, 1999.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. High School Magazine: For Principals, Assistant Principals, and All High School Leaders. National Association of Secondary School Principals, 1999.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.