TY  - BOOK
AU  - Pelgrum,Willem J.
AU  - Plomp, Tjeerd 
TI  - The IEA Study of computers in Education : Implementation of an Innovation in 21 Education systems
SN  - 0 08 041935 6
U1  - 371.39445 
PY  - 1993///
CY  - Oxford
PB  - Pergamon Press
KW  - School Education
ER  -