TY  - BOOK
AU  - Unwin, Derick.
TI  - The Encychlopaedia of Educational Media Communications and Technolgy
SN  - 313201291
AV  - REF LB 1042 5 U5 1978 
CY  - Westport 
PB  -  Greenwood press
KW  - Audio - Visual materials - Dictionaries
ER  -