The economics of new educational media /
- Paris : Unesco Pr., c 1980.
- 316 p. ; 24 cm.
- Educational methods and techniques, 1. .
V. 2- Cost and effectiveness ;
322 322
92-3-101693-8
Educational technology.
370.1934 / U2c
V. 2- Cost and effectiveness ;
322 322
92-3-101693-8
Educational technology.
370.1934 / U2c