Não informado. (2002). Principal Leadership. National Association of Secondary School Principals.
Cita Chicago Style (17a ed.)Não informado. Principal Leadership. Reston, Va: National Association of Secondary School Principals, 2002.
Cita MLA (8a ed.)Não informado. Principal Leadership. National Association of Secondary School Principals, 2002.
Precaución: Estas citas no son 100% exactas.