Title: Frogman Spy
Author: Joseph Bernard Hutton
Hutton, J. Bernard (1960). Frogman Spy: The Incredible Case of Commander Crabb: New York: McDowell, Obolensky
- Published in London in 1960 under title: Frogman Extraordinary.
Date Posted: October 10, 2016
Reviewed by Paul W. Blackstock and Frank L. Schaf
The story of Commander Lionel Philip Kenneth Crabb, British naval officer who was killed while attempting to obtain information on a Soviet naval vessel that had brought Khrushchev to Britain on a state visit.
 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