SIMMONS, H. (1980). THE PSYCHOSOCIAL ORIGINS OF MENTAL RETARDATION. PSYCHOGENIC DISEASE PUBLISHING CO.
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Dyfyniad Arddull Chicago
SIMMONS, H.E. THE PSYCHOSOCIAL ORIGINS OF MENTAL RETARDATION. SACRAMENTO,CA: PSYCHOGENIC DISEASE PUBLISHING CO, 1980.
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Dyfyniad MLA
SIMMONS, H.E. THE PSYCHOSOCIAL ORIGINS OF MENTAL RETARDATION. PSYCHOGENIC DISEASE PUBLISHING CO, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.