International Association for the Scientific Study of Mental Deficienc

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  Motor Development, Adapted Physical Activity, and Mental Retardation
  by International Association for the Scientific Study of Mental Deficienc, Symposium on Motor Development and Adapted Physical Activity, International Council of Sport Science and Physical Education. Research Committee, Adri Vermeer
  Hardcover, S Karger Pub, ISBN 380555169X (3-8055-5169-X)
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  Physical and Motor Development in Mental Retardation
  by Adri Vermeer, International Association for the Scientific Study of Mental Deficienc, W. E. Davis
  Hardcover, S Karger Pub, ISBN 3805561180 (3-8055-6118-0)