TY  - BOOK
AU  - Pelgrum,Willem J (Ed)
AU  - Plomp,Tjeerd (Ed)
TI  - IEA study of computers in education: : Implementation of an innovation in 21 education systems 
PY  - 1993///
CY  - Oxford: 
PB  - Pergamon Press, 
KW  - Computer
KW  - Education
ER  -