Não informado. (2012). Communicator. National Association of Elementary School Principals.
Chicago-referens (17:e uppl.)Não informado. Communicator. Alexandria, Va: National Association of Elementary School Principals, 2012.
MLA-referens (8:e uppl.)Não informado. Communicator. National Association of Elementary School Principals, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.