Title: Reasons to Smile: Celebrating People Living with Down Syndrome, Author: Andrea Knauss
Title: Life Skills: A Handbook for Parents & Teachers of the Intellectually Disabled:, Author: Shari Pierce
Title: Developmental Disability and Behaviour, Author: Christopher Gillberg
Title: Retardation in Young Children: A Developmental Study of Cognitive Deficit, Author: Sarah H. Broman
Title: The Experimental Psychology of Mental Retardation, Author: Donald K. Routh