Big Four (Scotland Yard)
The Big Four was a nickname given to the four Superintendents in charge of the Criminal Investigation Department at Scotland Yard, the headquarters of the Metropolitan Police, from about 1919 onwards.
- Wensley, Frederick (1931), Detective Days, Cassel, p. 196
- Gribble, Leonard Reginald (1966), Great manhunters of the Yard, Long, p. 79
- Woodhall, Edwin T. (1935). Crime and the Supernatural. London: Long. p. 46.
- Harding, Arthur (1981). Samuel, Raphael, ed. East end underworld: chapters in the life of Arthur Harding. Taylor & Francis. p. 337. ISBN 0-7100-0726-4.
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