- Pedro T. Isaías, Nitya Karmakar, Luís Rodrigues, Patrícia Barbosa, editors, Proceedings of the IADIS International Conference WWW/Internet 2004, Madrid, Spain, 2 Volumes. IADIS, 2004.
- Kinshuk, Demetrios G. Sampson, Pedro T. Isaías, editors, Cognition and Exploratory Learning in Digital Age (CELDA 04), Proceedings of the IADIS International Conference, Lisbon, Portugal, 15-17 December 2004. IADIS, 2004.