FENN, G. Language Without Speech (Paper presented to the A.G.M. of the British Association for Applied Linguistics, Edinburgh, 1974). Dept. of Education, Univ. of Cambridge, 1974.
JONES, S. Paget Gorman Signed Speech. Proceedings of International Symposium on Specific Speech and Language Disorders in Children, AFASIC, Reading, 1987, pp. 340-348. London: AFASIC, 1987.
RIPLEY, K. & DAINES, R.. Reading and Signing: A Pilot Study of the use of PGSS with Mainstream School Children with Specific Literacy Difficulties. Unpublished, 1991,