TY  - BOOK
AU  - Trowbridge,N.E.
TI  - The new media challenge
SN  - 0333130790
U1  - 371.33 
PY  - 1974///
CY  - London
PB  - Macmillan
KW  - Audio-visual education
N1  - Bibliography: p. 114-116
ER  -