TY  - GEN
AU  - Unwin,Derick
TI  - Encyclopedia of educational media communications and technology
SN  - 0333185501 (hbk.)
AV  - HD30.15HF5621 .B55 2014 vol. 1
U1  - 371.3078 
PY  - 1978///
CY  - London
PB  - McMillan
KW  - Encyclopedia
KW  - Media communication
N1  - Include references & index
ER  -