International Telecommunications Union ยท T. I.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Data Communication Networks: Transmission,Signalling and Switching,Network Aspects,Maintenance,Administrative Arrangements;Recommendations X.40-X.180 | 978-92-61-01171-0 (92-61-01171-3) | 1981 |
| General Characteristics of International Telephone Connections and Circuits: Recommendations G.101-G.171 | 978-92-61-00961-8 (92-61-00961-1) | 1981 |
| Telematic Services: Operations and Quality of Service | 978-92-61-02031-6 (92-61-02031-3) | 1985 |
International Telegraph and Telephone Consultative Committee