- J.C. Masterman "The Double-Cross System in the War of 1939 to 1945" Yale University Press. 1972
- Sebastian Haffner "Defying Hitler. A Memoir" Farrar, Straus and Giroux. 2002
- Mark Riebling "Wedge. The Secret War Between the FBI and the CIA" Alfred A. Knopf. 1994