Estatísticas das comunicações 1990-1994
Telegeography 1995 : global telecommunications traffic statistics & commentary / ed. Gregory C. Staple
Purchasing power parities and real expenditures : EKS results 1993 / Organisation for Economic co-Operation and Development
Statistical yearbook 96 : cinema television video and new media in Europe / European Audiovisual Observatory
Les pratiques et principles de tarification des télécommunications internationales : rapport d'étape / Organisation de Coopération et de Développement Économiques