Não informado. (1966). Education and Training of the Mentally Retarded. Council for Exceptional Children, Division on Mental Retardation.
Chicago-Zitierstil (17. Ausg.)Não informado. Education and Training of the Mentally Retarded. Reston, Va: Council for Exceptional Children, Division on Mental Retardation, 1966.
MLA-Zitierstil (8. Ausg.)Não informado. Education and Training of the Mentally Retarded. Council for Exceptional Children, Division on Mental Retardation, 1966.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.