Não informado. (1974). Special Education. National Council for Special Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Special Education. London: National Council for Special Education, 1974.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Special Education. National Council for Special Education, 1974.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.
