By Shaddock A.J.   Dowse L.   Richards H.   Spinks A.T.   in Journal of Intellectual & Developmental Disability

ISSN:1469-9532|23|4|279-293

Informa Healthcare‎(1998)‎

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By Shaddock Anthony J.   Spinks Anthony T.   Esbensen Anna   in International Journal of Disability, Development and Education

ISSN:1465-346X|47|4|383-395

Routledge Ltd‎(2000)‎

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