Não informado. (1977). Exceptional Child Education Resources. Council for Exceptional Children.
Chicago-Zitierstil (17. Ausg.)Não informado. Exceptional Child Education Resources. Reston, Va: Council for Exceptional Children, 1977.
MLA-Zitierstil (8. Ausg.)Não informado. Exceptional Child Education Resources. Council for Exceptional Children, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.