Cita APA (7a ed.)

National Computing Centre Limited. (1982). Introducing Computarised Telephone Switchboards [PABxs] (1a impr.). The National Computing Centre Limited N.C.C..

Cita Chicago Style (17a ed.)

National Computing Centre Limited. Introducing Computarised Telephone Switchboards [PABxs]. 1a impr. Manchester: The National Computing Centre Limited N.C.C., 1982.

Cita MLA (8a ed.)

National Computing Centre Limited. Introducing Computarised Telephone Switchboards [PABxs]. 1a impr. The National Computing Centre Limited N.C.C., 1982.