Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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