著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL International Telegraph and Telephone Consultative Committee. Plenary Assembly and International Telecommunication Union and International Telegraph and Telephone Consultative Committee,"Data communication networks : transmission, signalling and switching, network aspects, maintenance, administative arrangements : recommendations X.40-X.180",,International Telecommunication Union,1981,"Yellow book : VIIth Plenary Assembly, Geneva, 10-21 November 1980",,9261011713,,https://cir.nii.ac.jp/crid/1130282268944547712