Yellow book :Seventh Plenary Assembly Geneva 10-21 November 1980
| Author(s) : | International Telecommunication Union , International Telegraph and Telephone Consultative Committee.Plenary Assembly, |
| Publisher : | Geneva :International Telecommunication Union |
| Publication Date : | 1981 |
| ISSN : | 9261009611 |
| Location : | Main, |
| Call Number : | TK6006.I57 1980 |