7Nielsen L (1988) Spatial Relations in Congenitally Blind Infants. Refsnaeeskolen, Denmark

8Further Reading: For further information on these techniques, the reader is invited to refer to the original sources such as:

van Dijk J

(1965) The first steps of deaf-blind children towards language. Proceedings of Conference on the Deaf-Blind: Refsnaesskolen Denmark. Boston: Perkins School for the Blind.

van Dijk J

(1967) The non verbal deaf-blind child and his world: his outgrowth towards the world of symbols. Holland: Institute for the Deaf

van Dijk J

(1986) An educational curriculum for deaf-blind multi-handicapped per sons, In D Ellis (ed) Sensory Impairments in mentally handicapped people. London, Croom-Helm.

Other authors have taken up these themes applying them in broadly similar contexts.