APA (7th ed.) Citation

London Transport Board. (1982). The London underground: Diagram of lines and West End and City zones. London Transport.

Chicago Style (17th ed.) Citation

London Transport Board. The London Underground: Diagram of Lines and West End and City Zones. London: London Transport, 1982.

MLA (9th ed.) Citation

London Transport Board. The London Underground: Diagram of Lines and West End and City Zones. London Transport, 1982.