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  • Pieter C. Duker, M. Kraaykamp, Evert-Jan Visser
  • Psychology, Medicine
  • Journal of intellectual disability research…
  • 1994 (First Published: 28 June 2008)
  • Various procedures have been used to establish and increase manual signed and spoken requesting with individuals who are intellectually disabled. A few studies have used the so-called blockableContinue Reading