Service de radiodiffusion : (télévision): recommandations du CCIR, 1990: (ainsi que résolutions et voeux): volume XI- partie 1 / Union Internationale des Télécommunications
Data communication networks : open systems interconnection (OSI) model and notation, service definition: recommendations X.200 - X.219 /International Telecommunication Union
Data communication networks : open systems interconnection (OSI) protocol specifications, conformance testing: recommendations X.220 - X.290 /International Telecommunication Union
Data communication networks : interworking between networks, mobile data transmission systems, internetwork management: recommendations X.300 - X.370 /International Telecommunication Union
Data communication networks : message handling systems: recommendations X.400 - X.420 /International Telecommunication Union
EPHOS : european procurement handbook for open systems: version 7.0 / Commission of the European Communities