ESPRIT '91 Brussels, Belgium, & Commission of the European Communities. Directorate-General for Telecommunications, Information Industries, and Innovation. (1991). Esprit '91: Proceedings of the annual ESPRIT Conference, Brussels, 25-29 November, 1991. Commission of the European Communities.
Παραπομπή σε μορφή Chicago (17η εκδ.)ESPRIT '91 Brussels, Belgium, και Information Industries Commission of the European Communities. Directorate-General for Telecommunications. Esprit '91: Proceedings of the Annual ESPRIT Conference, Brussels, 25-29 November, 1991. Brussels: Commission of the European Communities, 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)ESPRIT '91 Brussels, Belgium, και Information Industries Commission of the European Communities. Directorate-General for Telecommunications. Esprit '91: Proceedings of the Annual ESPRIT Conference, Brussels, 25-29 November, 1991. Commission of the European Communities, 1991.