1. Communicating without Speech: Practical Augmentative and Alternative Communication;Cockerill,2001
2. Developing communication: early intervention and augmentative signing;Gompertz,1997
3. Children with Autism and Asperger Syndrome: a Guide for Practitioners and Carers;Howlin,1998
4. Introduction to Augmentative and Alternative Communication;Von Tetzchner,2000