Waves of Words. International Society for Augmentative & Alternative Communication / Books.
Chicago-viite (17. p.)Waves of Words. International Society for Augmentative & Alternative Communication / Books.
MLA-viite (9. p.)Waves of Words. International Society for Augmentative & Alternative Communication / Books.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.