Picture communication symbols

Manylion Llyfryddiaeth
Prif Awdur:	Johnson, Roxanna Mayer
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	Solana Beach, Calif. Mayer-Johnson c1995.
Rhifyn:	Wordless ed.
Pynciau:	Nonverbal communication in education. Special education. Self-help devices for people with disabilities. Signs and symbols. Visual communication.