Performance indicators for public telecommunications operators. [ca. 1990]. In Information, computer, communications policy [Book]. Paris.
ISO-690 (author-date, English)Performance indicators for public telecommunications operators, 1990. . Paris. Information, computer, communications policy, 22. ISBN 9264134034.
Modern Language Association 9th edition„Performance indicators for public telecommunications operators“. Information, computer, communications policy, book, 1990.
Mohr Siebeck - Recht (Deutsch - Österreich): Performance indicators for public telecommunications operators, . Information, computer, communications policy, Paris 1990.
Emerald - HarvardPerformance indicators for public telecommunications operators. (1990), Information, computer, communications policy, Bd. , Paris.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.