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Dyfyniad Arddull Chicago"The Retarded Child. A Guide for Parents." Ment Health (Lond) 1949.
Dyfyniad MLA"The Retarded Child. A Guide for Parents." Ment Health (Lond) 1949.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.