Cite
APA Citation
Institution,, B. S. (1991). Information Systems Interconnection. ISDN. Provision of OSI connection-mode transport service over the OSI connection-mode network service by using an ISDN circuit-mode 64 kbit/s unrestricted bearer service. Permanent case.. London : British Standards Institution. http://access.bl.uk/ark:/81055/vdc_100104095208.0x000001