Cita APA (7a ed.)

Williams, G. R. (1972). The hidden world of Scotland Yard. Hutchinson.

Cita Chicago Style (17a ed.)

Williams, Guy R. The Hidden World of Scotland Yard. London: Hutchinson, 1972.

Cita MLA (8a ed.)

Williams, Guy R. The Hidden World of Scotland Yard. Hutchinson, 1972.