1. Use of the Behavioural Approach in Teaching counting for children with Down syndrome;Abdelahmeed;International Journal of special education,2009
2. Do children with Down syndrome have difficulty in counting and why?;Abdelhameed;International Journal of Special Education,2007
3. Self-invented addition strategies by children with mental retardation;Baroody;American Journal on Mental Retardation,1996
4. Counting skills and number concepts of students with moderate intellectual disabilities;Bashash;International Journal of Disability, Development and Education,2003
5. Number and arithmetic skills in children with Down Syndrome;Brigstocke;Down Syndrome Research and Practice,2008