E. Gourova, K. Ducatel, J. Gavigan, F. Scapolo, и P. Pietrogiacomo. (1101 2001)NT: Produced by the European Commission, Joint Research Centre. Study carried out by the Institute for Prospective Technological Studies.; LV: Available online; EM: 2004.
M. Sharma. (1001 1990)NT: Keynote address delivered at the International Conference on Educational Technology: The Future (New Delhi, India, October 31-November 3, 1990).; LV: Available online; EM: 1991.