APA (7th ed.) Citation

London Transport Board. (1990). Travelling in London: A visitors guide to London transport. [London Transport Board?].

Chicago Style (17th ed.) Citation

London Transport Board. Travelling in London: A Visitors Guide to London Transport. [London]: [London Transport Board?], 1990.

MLA (9th ed.) Citation

London Transport Board. Travelling in London: A Visitors Guide to London Transport. [London Transport Board?], 1990.

Warning: These citations may not always be 100% accurate.