Author: M. G. Richings
Richings, Mildred Gladys (1935). Espionage: The Story of The Secret Service of The English Crown. London, Hutchinson & Co., Ltd
Date Posted: October 7, 2016
Reviewed by Paul W. Blackstock and Frank L. Schaf
The only other book-length treatment of the British Secret Service besides Deacon’s history. An account from the fourteenth century through the reign of Edward VII in 1910.
 Blackstock, Paul W. (1978) and Frank L. Schaf, Jr. Intelligence, Espionage, Counterespionage, And Covert Operations: A Guide to Information Sources. Detroit: Gale Research Co., p. 155