The following have proved invaluable as reference sources and also as inspiration for a number of the ‘concepts’ which appear in this book: The Last Days of Hitler by H. R. Trevor-Roper (Macmillan, 1947; Pan, 1968); The Double Cross System by J. C. Masterman (Yale University Press, 1972, Sphere, 1973); Einstein by Banesh Hoffmann (Hart-Davis, Mac-Gibbon, 1973; Paladin, 1975); and not least C. G. Jung’s Structure and Dynamics of the Psyche.
I should also like to thank Pam Yeowart for her help with the German translations.