Não informado. Spectator. National Association of Elementary School Principals.
Chicago-referens (17:e uppl.)Não informado. Spectator. Arlington, Va: National Association of Elementary School Principals.
MLA-referens (8:e uppl.)Não informado. Spectator. National Association of Elementary School Principals.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.