Não informado. (2002). Principal Leadership. National Association of Secondary School Principals.
Style de citation Chicago (17e éd.)Não informado. Principal Leadership. Reston, Va: National Association of Secondary School Principals, 2002.
Style de citation MLA (8e éd.)Não informado. Principal Leadership. National Association of Secondary School Principals, 2002.
Attention : ces citations peuvent ne pas être correctes à 100%.