TY  - BOOK
AU  - Unwin,Derick
AU  - McAleese,Ray
TI  - The Encyclopaedia of educational media communications and technology
SN  - 0313209219
PY  - 1979///
CY  - Westport, Conn.
PB  - Greenwood Press
KW  - Audio
KW  - visual materials
KW  - Dictionaries
KW  - Educational technology
ER  -