TY  - BOOK
ED  - Unesco.
ED  - International Council for Educational Media.
TI  - The Economics of new educational media
T2  - Educational methods and techniques
SN  - 9231014234
U1  - 371.3 
PY  - 1977///
CY  - Paris
PB  - Unesco
KW  - Educational technology
N1  - "Prepared with the assistance of the International Council for Educational Media."; Includes bibliographies; v. 1. Present status of research and trends -- v. 2. Cost and effectiveness -- v. 3. Cost and effectiveness overview and synthesis
ER  -