Não informado. (1980). Principal. National Association of Elementary School Principals.
Style de citation Chicago (17e éd.)Não informado. Principal. Arlington, Va: National Association of Elementary School Principals, 1980.
Style de citation MLA (8e éd.)Não informado. Principal. National Association of Elementary School Principals, 1980.
Attention : ces citations peuvent ne pas être correctes à 100%.