Citazione Stile APA (7a Edizione)

International Federation for Documentation. (1969). Universal decimal classification: UDC 654: telecommunication services: organization, administration and operation (Eng. full ed.). British Standards Institution.

Citazione stile Chigago Style (17a edizione)

International Federation for Documentation. Universal Decimal Classification: UDC 654: Telecommunication Services: Organization, Administration and Operation. Eng. full ed. London: British Standards Institution, 1969.

Citatione MLA (8a ed.)

International Federation for Documentation. Universal Decimal Classification: UDC 654: Telecommunication Services: Organization, Administration and Operation. Eng. full ed. British Standards Institution, 1969.