Não informado. (1977). Exceptional Child Education Resources. Council for Exceptional Children.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Exceptional Child Education Resources. Reston, Va: Council for Exceptional Children, 1977.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Exceptional Child Education Resources. Council for Exceptional Children, 1977.
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