TY  - BOOK
AU  - Mann,A.P.,ed
TI  - Aspects of educational technology
SN  - 0273003003
U1  - 371.33/A838 
PY  - 1969///-1973
CY  - London
PB  - Pitman publishing
KW  - Educational technology
N1  - * Lib. has vol.: 3, 4, 5 and 7. * Bibliographical references at the end of chapters
ER  -