APA (7th ed.) Citation

Day, J. R. (1971). The story of London's Underground (Rev. and enl.). London Transport.

Chicago Style (17th ed.) Citation

Day, John Robert. The Story of London's Underground. Rev. and enl. [London]: London Transport, 1971.

MLA (9th ed.) Citation

Day, John Robert. The Story of London's Underground. Rev. and enl. London Transport, 1971.