Não informado. (1932). National Elementary Principal. National Association of Elementary School Principals.
Cita Chicago Style (17a ed.)Não informado. National Elementary Principal. Arlington, Va: National Association of Elementary School Principals, 1932.
Cita MLA (8a ed.)Não informado. National Elementary Principal. National Association of Elementary School Principals, 1932.
Precaución: Estas citas no son 100% exactas.