Não informado. (1932). National Elementary Principal. National Association of Elementary School Principals.
Style de citation Chicago (17e éd.)Não informado. National Elementary Principal. Arlington, Va: National Association of Elementary School Principals, 1932.
Style de citation MLA (8e éd.)Não informado. National Elementary Principal. National Association of Elementary School Principals, 1932.
Attention : ces citations peuvent ne pas être correctes à 100%.