^Bryant, C.C. (2007). Prague in black: Nazi rule and Czech nationalism, Harvard University Press, ISBN0-674-02451-6, p. 125
^Hans Rudolf Fuhrer. Spionage gegen die Schweiz. Huber. 1982: 68. ISBN 3-274-00003-5.
^Jeremy Noakes, Geoffrey Pridham. Nazism, 1919-1945: Foreign policy, war and racial extermination. University of Exeter Press. 1995: 882. ISBN 0-85989-474-6.