| 1 |
Second Information Technology in Education Study : SITES 2006 technical report / edited by Ralpf Carstens, Willem J. Pelgrum
Amsterdam : International Association for the Evaluation of Educational Achievement , c2009
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| 2 |
Pedagogy and ICT use in schools around the world : findings from the IEA sites 2006 study / edited by Nancy Law, Willem J. Pelgrum, Tjeerd Plomp
[S.l.] : Springer. - Hong Kong : Comparative Education Research Centre, the University of Hong Kong , 2008
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| 3 |
The use of computers in education worldwide : results from the IEA "Computers in education" survey in 19 educational systems / Willem J. Pelgrum, Tjeerd Plomp
1st ed. - Oxford ; New York : Publishted for the International Association for Educational Achievement by Pergamon Press , 1991
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