European Commission on the Development of Educational Software. Conference, Commission of the European Communities, Plomp, T., Deursen, K. v., & Moonen, J. (1987). CAL for Europe: Computer-assisted learning for Europe : proceedings of a Conference of the European Commission on the Development of Educational Software, Enschede, The Netherlands, 25-28 May 1986. North-Holland ; Elsevier Science Publishers ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co..
Παραπομπή σε μορφή Chicago (17η εκδ.)European Commission on the Development of Educational Software. Conference, Commission of the European Communities, Tj Plomp, Koos van Deursen, και Jef Moonen. CAL for Europe: Computer-assisted Learning for Europe : Proceedings of a Conference of the European Commission on the Development of Educational Software, Enschede, The Netherlands, 25-28 May 1986. Amsterdam ; New York : Amsterdam, Netherlands : New York, N.Y.: North-Holland ; Elsevier Science Publishers ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1987.
Παραπομπή σε μορφή MLA (9th εκδ.)European Commission on the Development of Educational Software. Conference, et al. CAL for Europe: Computer-assisted Learning for Europe : Proceedings of a Conference of the European Commission on the Development of Educational Software, Enschede, The Netherlands, 25-28 May 1986. North-Holland ; Elsevier Science Publishers ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1987.