Não informado. (1999). Shools in the middle. National Association of Secondary School Principals.
Style de citation Chicago (17e éd.)Não informado. Shools in the Middle. Reston, Va: National Association of Secondary School Principals, 1999.
Style de citation MLA (8e éd.)Não informado. Shools in the Middle. National Association of Secondary School Principals, 1999.
Attention : ces citations peuvent ne pas être correctes à 100%.